All Entries in the Category "Searching the ADS"
ADS’s one box search form supports both fielded and unfielded queries. Unfielded queries without search terms will search the metadata of the publications, including author, publication year, title, abstract, identifiers, and bibstem, which may not produce the expected results. For instance, if you are searching for papers by the author Marc Mars, you want to search for author:“Mars, Marc” instead of Marc Mars to make sure that you don’t return papers that simply have the words “Marc” and “Mars” somewhere in the article metadata.
Above the search box we supply shortcuts to frequently used search fields. Simply click on the field that you wish to search and enter your search term in the provided location (generally between the supplied quotation marks). Alternatively, if you start entering the name of a field an autocomplete feature will suggest a list of possible search fields. You may string several search terms or use the filters provided with your results to help narrow the search selection. For instance if you want to find articles published between 1980 and 1990 by John Huchra, you can use:
author:"Huchra, John" year:1980-1990
To get you started, here is a list of search examples for commonly used fields:
|author:“huchra, john”||search for papers written by an author|
|author:“^huchra, john”||limit search to first-author papers|
|^huchra, john||limit search to first-author papers|
|abs:“dark energy”||search for the phrase “dark energy” in abstract, title and keywords|
|year:2000||search for publications written in 2000|
|year:2000-2005||search for publications written between 2000 and 2005 (inclusive)|
|body:“gravitational waves”||search for papers containing the phrase “gravitational waves” in the body of an article|
|full:“gravitational waves”||search for papers containing the phrase “gravitational waves” in a number of fields (title, abstract, body, acknowledgements and keywords)|
|bibstem:ApJ||select papers published in a particular publication|
|object:((SMC OR LMC) AND M31)||using the SIMBAD object search, find papers tagged with either SMC or LMC and M31|
The rest of this page goes over the search syntax and fields indexed in our database.
Combining Search Terms to Make a Compound Query
You can string together any number of search terms to develop a query. By default search terms will be combined using AND as the default boolean operator, but this can be changed by explicitly specifying OR beween them. Similarly one can exclude a term by prepending a “-“ sign to it (or using the boolean “NOT”). Multiple search words or phrases may be grouped in a fielded query by enclosing them in parenthesis. Some examples:
|abstract:(QSO “dark energy”)||papers containing both “QSO” and “dark energy” in their abstract|
|abstract:(QSO OR “dark energy”)||papers containing either “QSO” or “dark energy in their abstract|
|author:“huchra, j” abstract:cfa||papers by J. Huchra which have “cfa” in their abstract|
|author:“huchra, j” OR abstract:“great wall”||papers by J. Huchra or which mention “great wall” in their abstract|
|author:“huchra, j” -title:2mass||papers by “J. Huchra” but excludes ones with “2mass” in their title|
|author:“huchra, j” NOT title:2mass||same as above|
Operator precedence in multi-part searches
Searches involving only two search terms, as shown above, are straightforward to parse. However, for searches with multiple search terms and multiple operators, understanding how operators take precendence over each other is important. For the most control, use parentheses around terms and operators that should be executed first. Otherwise, operators follow these general rules:
- AND, OR, and NOT are set operators, operating on the search terms on either side. AND takes the intersection of the result set of the two search terms, OR takes the union, and NOT takes the difference. NOT takes precendence over AND, which takes precendence over OR.
- The default AND (i.e., not typing out AND but using just a blank space between the two terms, as in the first example above) has lower precedence than any of the Boolean operators above.
- The negative sign (-) is read as “prohibit”; results containing this term are completely excluded. In multi-part queries, its behavior can differ from that of NOT, because of the precedence rules.
|Example Query||Parsed as|
|aff:(China OR “Hong Kong” AND Taiwan)||aff:(China OR (“Hong Kong” AND Taiwan))|
|aff:(China OR “Hong Kong” Taiwan)||aff:((China OR “Hong Kong”) AND Taiwan)|
|aff:(China OR “Hong Kong” NOT Taiwan)||aff:(China OR (“Hong Kong” NOT Taiwan))|
|aff:(China OR “Hong Kong” -Taiwan)||aff:((China OR “Hong Kong”) NOT Taiwan)|
Synonyms and Acronyms
By default most search terms in ADS are expanded by adding a list of words which are synonyms of the search term. So for example, a search of “star” in the title field will be expanded to include words such as “stars,” “stellar,” “starry,” “starlike,” and so on. (Notice that this often includes words in foreign languages such as “etoile,” “stern,” and “stella”). While this feature improves recall, it sometimes compromises the precision of the results. Our search engine allows one to turn off the synonym expansion feature by simply prepending an “=” sign in front of the search term.
Our search engine also identifies acronyms during indexing and searching (defined as words consisting entirely of uppercase characters). A search for an uppercase word will only match documents which contain that acronym, whereas a search for a lowercase word will match documents which contain any variation of the word, irregardless of its case. Acronyms can themselves have synonyms (for example “ADS” and “Astrophysics Data System” are synonyms), so one should be aware that there is an interaction between case-sensitiveness and synonym expansion. The examples below illustrate these effects:
|title:star||title contains “star”, any of its synonyms, or the acronym “STAR”|
|title:etoile||title contains “star” or any of its synonyms (etoile being a synonym of star);
the results differ from above since “STAR” is not searched for
|=title:star||title contains “star” or the acronym “STAR”|
|=title:etoile||title contains “etoile”|
|title:STAR||title contains the acronym “STAR”|
|title:(=star -STAR)||title contains “star” but not the acronym “STAR”|
|fuse||the word “fuse” or acronym “FUSE” appear anywhere in the paper|
|FUSE||the acronym “FUSE” appears anywhere in paper|
Synoym expansion also applies to author names, which provide a way to account for changes in a person’s name and/or different spellings due to transliterations. In addition to this, the default author search in ADS is “greedy” in the sense that it will return all documents in which an author signature may match the input search string. This allows, for instance, to have an author search for “Huchra, John” to return papers where the author name appears as “Huchra, John” or “Huchra, J.” By prepending the “=” character to the author search one can disable this feature (as well as any additional synonym expansion) and require an exact match on the author name. Some examples:
|author:"murray, s"||Least precise variations: finds records authored by any of the following:
|author:"murray, stephen"||More precise variations: finds record authored by any of the following:
|author:"murray, stephen s"||Most precise variations: finds record authored by any of the following:
|=author:"murray, s"||Matches only records authored by "Murray, S."|
|=author:"murray, stephen"||Matches only records authored by "Murray, Stephen"|
|=author:"murray, stephen s"||Matches only records authored by "Murray, Stephen S."|
As a general rule we recommend to use the full name of the person for author searches since as can be seen above the matching rules in ADS are designed to find the maximal set of records consistent with the author specification given by the user. Rather than disabling the name-variation algorithm described above, we recommend performing refinement of search results via the user interface filters for author names as described in the “Filter your search” section.
This is a list of fields currently recognized by the ADS search engine and the preferred search format:
|Abstract/Title/Keywords||abs:“phrase”||abs:“dark energy”||search for word or phrase in abstract, title and keywords|
|Acknowledgements||ack:“phrase”||ack:“ADS”||search for a word or phrase in the ackknowledgements|
|Affiliation||aff:“phrase”||aff:“harvard”||search for word or phrase in affiliation field|
|Abstract||abstract:“phrase”||abstract:“dark energy”||search for a word or phrase in an abstract only|
|Alternate Bibcode||alternate_bibcode:adsbib||alternate_bibcode:2003AJ….125..525J||finds articles that used to (or still have) this bibcode|
|Alternate Title||alternate_title:“phrase”||alternate_title:“Gammablitz”||search for a word or phrase in an articles title if they have more than one, in multiple languages|
|arXiv ID||arXiv:arxivid||arXiv:1108.0669||finds a specific record using its arXiv id|
|arXiv Class||arxiv_class:arxivclass||arxiv_class:“High Energy Physics - Experiment”||finds all arXiv pre-prints in the class specified|
|Author||author:“Last, F”||author:“huchra, j”||author name may include just lastname and initial|
|Author (cont.)||author:“Last, First […]”||author:“huchra, john p”||an example of stricter author search (recommended)|
|Bibcode||bibcode:adsbib||bibcode:2003AJ….125..525J||finds a specific record using the ADS bibcode|
|Bibliographic groups||bibgroup:name||bibgroup:HST||limit search to papers in HST bibliography (*)|
|Bibliographic stem||bibstem:adsbibstem||bibstem:ApJ||find records that contain a specific bibstem in their bibcode|
|Body||body:“phrase”||body:“gravitational waves”||search for a word or phrase in (only) the full text|
|Citation count||citation_count:count||citation_count:40||find records that have a specific number of citations|
|Copyright||copyright:copyright||copyright:2012||search for articles with certain copyrights|
|Data links||data:archive||data:NED||limit search to papers with data from NED (*)|
|Database||database:DB||database:astronomy||limit search to either astronomy or physics or general|
|Date Range||pubdate:[YYYY-MM TO YYYY-MM]||pubdate:[2005-10 TO 2006-09]||use fine-grained dates for publication range|
|Document type||doctype:type||doctype:catalog||limit search to records corresponding to data catalogs (*)|
|DOI||doi:DOI||doi:10.1086/345794||finds a specific record using its digital object id|
|First Author||^Last, F
|limit the search to first-author papers|
|Fulltext||full:“phrase”||full:“gravitational waves”||search for word or phrase in fulltext, acknowledgements, abstract, title and keywords|
|Grant||grant:grant||grant:NASA||finds papers with specific grants listed in them|
|Identifiers||identifier:bibcode||identifier:2003AJ….125..525J||finds a paper using any of its identifiers, arXiv, bibcode, doi, etc.|
|Issue||issue:number||issue:10||search for papers in a certain issue|
|Keywords||keyword:“phrase”||keyword:sun||search publisher- or author-supplied keywords|
|Language||lang:“language”||lang:korean||search for papers with a given language|
|Object||object:“object”||object:Andromeda||search for papers tagged with astronomical object by SIMBAD|
|ORCiD iDs||orcid:id||orcid:0000-0000-0000-0000||search for papers that are associated with a specific ORCiD iD|
|ORCiD iDs from publishers||orcid_pub:id||orcid_pub:0000-0000-0000-0000||search for papers that are associated with a specific ORCiD iD specified by a Publisher|
|ORCiD iDs from known ADS users||orcid_user:id||orcid_id:0000-0000-0000-0000||search for papers that are associated with a specific ORCiD iD claimed by known ADS users|
|ORCiD iDs from uknknown ADS users||orcid_other:id||orcid_other:0000-0000-0000-0000||search for papers that are associated with a specific ORCiD iD claimed by unknown ADS users|
|Page||page:number||page:410||search for papers with a given page number|
|Publication||bibstem:“abbrev”||bibstem:ApJ||limit search to a specific publication|
|Properties||property:type||property:openaccess||limit search to article with specific attributes (*)|
|Read count||read_count:count||read_count:10||search for papers with a given number of reads|
|Title||title:“phrase”||title:“weak lensing”||search for word or phrase in title field|
|VizieR keywords||vizier:“phrase”||vizier:“Optical”||search for papers with a given set of VizieR keywords|
|Volume||volume:volume||volume:10||search for papers with a given volume|
|Year||year:YYYY||year:2000||require specific publication year|
|Year Range||year:YYYY-YYYY||year:2000-2005||require publication date range|
(*) See below for details on these filters. In most cases, filtering of results based on these fields is available in the user interface.
The “properties” search field allows one to restrict the search results to papers which belong to a particular class. The allowed properties currently include:
|refereed||refereed papers only|
|notrefereed||non-refereed papers only|
|article||records corresponding to regular articles|
|nonarticle||not regular articles, for instance meeting abstracts, observing proposals, catalog descriptions, etc|
|ads_openaccess||OA version of article is available from ADS|
|eprint_openaccess||OA version of article is available from arXiv|
|pub_openaccess||OA version of article is available from publisher|
|openaccess||article has at least one openaccess version available|
|ocrabstract||records with an abstract generated from OCR (may contain typos or mistakes)|
The “bibgroup” search field allows restriction of the search results to one of the ADS bibliographic groups. These groups are curated by a number of librarians and archivists who maintain either institutional or “telescope” bibliographies on behalf of their projects. Here is a partial list. For more information on the criteria behind the curation of these groups, please see the link above.
The list of current Institutional bibgroups is: ARI, CfA, CFHT, Leiden, USNO
The list of current Telescope bibgroups is: ALMA, CXC, ESO, Gemini, Herschel, HST, ISO, IUE, JCMT, Keck, Magellan, NOAO, NRAO, ROSAT, SDO, SMA, Spitzer, Subaru, Swift, UKIRT, XMM
The “data” search field can be used to select papers which have data links associated to them. The list of archives which ADS links to can be seen under the “Data” filter selection. To generate a list of all records which have data links one can issue a simple wildcard query: data:* . Using the data search field allows one to focus on data-rich papers, for example:
data:(CXO OR XMM) AND data:HST
Finds multi-wavelength papers which have observations both in the X-ray spectrum (from Chandra or XMM) and in the optical (HST). Of course additional search terms can be used to further refine the selection criteria.
Records in ADS are assigned a document type which is indexed in the “doctype” search field, the contents of which are an extension of the BibTeX entry types. Currently these are the document types indexed by ADS:
|Document Type||Resource associated with record|
|eprint||article preprinted in arXiv|
|inproceedings||article appearing in a conference proceedings|
|inbook||article appearing in a book|
|bookreview||published book review|
|catalog||data catalog (or other high-level data product)|
|circular||printed or electronic circular|
|erratum||erratum to a journal article|
|newsletter||printed or electronic newsletter|
|obituary||obituary (article containing “obituary” in its title)|
|proceedings||conference proceedings book|
|proposal||observing or funding proposal|
|talk||research talk given at a scholarly venue|
|misc||anything not found in the above list|
Citation and Reference Operators
When you submit a query, ADS returns a list of search results. Should you want a list of all the articles which cite those search results , or all the articles which are referenced by those search results, you can use the citation or reference operators.
The syntax for these operators are references(query) and citations(query).
citations(author:"huchra, john") # returns the list of papers citing John Huchra's papers references(bibcode:2003AJ....125..525J) # returns papers cited by the paper 2003AJ....125..525J citations(abstract:HST) # returns papers citing papers which have "HST" in their abstract
One powerful aspect of having these operators at our disposal when creating a query is that we can combine them with additional search terms to expand or narrow your query. For example, the following query finds all papers which cite the original JWST paper as well as papers which contain the terms “Webb” or “JWST” in their abstract:
citations(bibcode:2006SSRv..123..485G) OR abstract:(Webb OR JWST)
Smart Searches (Second Order Queries)
We provide three operators which modify the query results by performing second-order operations on the original query. To invoke the operators, enter the corresponding operator before your search terms (enclosing your search terms in parentheses) in the search box.
Trending – returns the list of documents most read by users who read recent papers on the topic being researched; these are papers currently being read by people interested in this field. For example:
will return a ranked list of papers which are currently popular among the readers interested in exoplanets.
Useful – returns the list of documents frequently cited by the most relevant papers on the topic being researched; these are studies which discuss methods and techniques useful to conduct research in this field. For example:
will return a ranked list of papers spanning a variety of topics useful to researchers interested in analyzing surveys of galaxies.
Reviews – returns the list of documents citing the most relevant papers on the topic being researched; these are papers containing the most extensive reviews of the field. For example:
will return a ranked list of papers featuring reviews of weak gravitational lensing and its cosmological implications.
TopN – returns the list of top N documents for a user defined query, where they are ordered by their score or a user specified sort. For example:
topn(200, title:hubble, citation_count desc)
will return the first 200 most cited papers for documents that have “hubble” in their title.
Positional Field Searches
The pos() operator allows you to search for an item within a field by specifying the position in the field. The syntax for this operator is pos(fieldedquery,position,[endposition]). If no endposition is given, then it is assumed to be endposition = position, otherwise this performs a query within the range [position, endposition]. For example:
|pos(author:”Oort, J”,2)||papers which have “J. Oort” as the second author|
|pos(author:”Oort, J”,2,2)||same as above|
|pos(author:”Oort, J”,1,3)||papers which have “J. Oort” as first, second, or third author|
|pos(aff:harvard,1)||papers for which the first author has a Harvard affiliation|
|pos(title:M31,1)||papers for which the title start with “M31”|
Currently the pos() operator works on these fields: author, aff, title.
Filter your search
Once you have a results list from an initial query you can use our filters to further refine your search. Your results list will change each time you apply a limit.
Clicking on any of the listed terms within a filter will automatically apply that result as a filter and you will be prompted to choose “limit to” or “exclude”; if you want to choose more than one term within a specific filter you must first check the boxes next to the terms you want to choose and then choose the desired application ( and, or or exclude) from the apply box in that section.
- Authors: here you may chose to limit your search to include or exclude individual authors. To do this choose one or more authors and the apply function will activate. Here you can choose to “and”, “or” or “exclude” authors from your resulting list.
- Collections: here you may chose to add results from the database(s) that were not selected in your original query. You may also chose to exclude a database that was initially chosen. Note that all databases are automatically included in the one-box search on the Modern Form, but only the Astronomy database is automatically included on the Classic Form.
- Refereed status: here you may chose to include or exclude refereed or non-refereed publications.
- Keywords: here you may chose to narrow your results by including or excluding keywords that were found in the results of your original query.
- Publications: here you may chose to narrow your results by including or excluding journals that were found in the results of your original query.
- Bib Groups: here you may chose to include or exclude results from different Bib Groups within the ADS.
- SIMBAD Objects: here you may choose to include or exclude results that contain SIMBAD object types or individual objects.
- Data: here you may chose to include or exclude results that contain data in various archives (e.g. CDS, HEASARC, CXO, NED).
- Vizier Tables: here you may chose to include or exclude articles that have Vizier Tables.
- Grants: here you may choose to include or exclude grants by funders or fund numbers.
- Publication Type: here you may choose to include or exclude records based on the document type.
- Search for author:“Huchra, John”.
- Open the author filter; you will get a list that includes “Geller, M” and “Illingworth, G.” If you want the articles in which “Geller, M.” is a coauthor with “Huchra, John” you would click on the name “Geller, M.” in the list.
- If you want the articles in which either “Geller, M.” or “Illingworth, G” were coauthors you would click the boxes next to both of their names and choose “or” from the dropdown “apply” box. If you want the articles in which both “Geller, M.” and “Illingworth, G” were coauthors you would click the boxes next to both of their names and choose “and” from the dropdown “apply” box. (There should be zero results for this query!)
Comprehensive List of Solr Fields & Operators
This is an extensive list of methods of querying the ADS system. It is a technical document and you probably don’t need to read it unless you are interested in performing advanced searches.
Solr (Virtual) Fields, Operators, and Other Stuff
An aggregated list of the fields, operators, and other parameters that are accessible from Solr. Descriptions of what they are used for, and why or where they should or should not be shown to users.
|abstract||y||y||the abstract of the record|
|ack||y||y||Contains acknowledgements extracted from fulltexts (if identified in article).|
|aff||y||y||List of author affiliations in a given paper|
|alternate_bibcode||y||y||List of alternate bibcodes for that document|
|alternate_title||y||y||Alternate title, usually when the original title is not in English|
|arxiv_class||y||y||Which arXiv class was the paper submitted to|
|author||y||y||List of authors on a paper|
|author_count||y||y||Number of authors on a paper|
|author_facet||y||n||Contains list of names with the number of occurences that author has for the search (can only be searched)|
|author_facet_hier||y||n||Hierarchical facet field which contains author/author_id.|
|author_norm||y||y||List of authors with their first names shortened?|
|bibcode||y||y||ADS identifier of a paper|
|bibgroup||y||y||Bibliographic group that the bibcode belongs to (curated by staff outside of ADS)|
|bibgroup_facet||y||y||Contains list of groups with the number of occurrences that group has for the search|
|bibstem||y||y||the abbreviated name of the journal or publication, e.g., ApJ. Full lists of bibstems can be found here|
|bibstem_facet||y||n||Technical field, used for faceting by publication. It contains only bibstems without volumes (eg. Sci)|
|body||y||n||Contains extracted fulltext minus acknowledgements section|
|citation||y||y||List of bibcodes that cite the paper|
|citation_count||y||y||number of citations the item has received|
|cite_read_boost||y||y||Float values containing normalized (float) boost factors. These can be used with functional queries to modify ranking of results.|
|classic_factor||y||y||Integer values containing the boost factor used by ADS Classic. In essence log(1 + cites + norm_reads) where number of citations has been normalized and the whole value is multiplied by 5000 and then cast to Integer.|
|comment||y||tbd||This is currently indexed, but not stored. To see the values, Solr needs to also store it.|
|copyright||y||y||Copyright given by the publisher|
|data||y||y||List of sources that have data related to this bibcode|
|data_facet||y||n||Contains list of data with the number of occurrences that data has for the search|
|database||y||y||Database that the paper resides in (astronomy or physics)|
|date||y||y||Same as pubdate, but of time format and used for indexing; too excessive for a user to care about/use|
|doctype||y||y||Type of document: article, thesis, etc, these stem from classic|
|doctype_facet_hier||y||n||Hierarchical facets consisting of nested document types|
|doi||y||y||Digital object identifier|
|eid||y||y||electronic id of the paper (equivalent of page number)|
|y||n||List of e-mails for the authors that included them in the article; can be viewed only with elevated privileges|
|entdate||y||y||Creation date of ADS record in user-friendly format (YYYY-MM-DD)|
|entry_date||y||y||Creation date of ADS record in RFC 3339 (machine-readable) format|
|esources||y||y||Types of electronic sources available for a record (e.g. pub_html, eprint_pdf)|
|facility||y||tbd||List of facilities declared in paper (controlled list for AAS journals so far). Needs to be added in ADSImportpipeline and Solr schemas|
|first_author||y||y||First author of the paper|
|first_author_facet_hier||y||n||Contains list of first names with the number of occurrences that author has for the search, contains author/author_id|
|first_author_norm||y||y||n||First author of the paper with their first name shortened?|
|grant||y||y||Field that contains both grant ids and grant agencies.|
|grant_agencies||y||y||y||Index with just the grant agencies names (e.g. NASA).|
|grant_facet_hier||y||n||Hierarchical facet field which contains grant/grant_id. This field is not suitable for user queries, but rather for UI components. Term frequencies and positions are deactivated.|
|grant_id||y||y||y||Index with just the grant ids (e.g. 0618398)|
|id||y||y||a unique integer for this record. Generally not useful, but used by Andy Casey’s python client|
|identifier||y||n||Abstract field that can be used to search an array of alternative identifiers for the record. May contain alternative bibcodes, DOIs and/or arxiv ids.|
|indexstamp||y||y||Date at which the document was indexed by Solr YYYY-MM-DD’T’hh:mm:ss.SSS’Z’|
|isbn||y||tbd||ISBN of the publication (this applies to books)|
|issn||y||tbd||ISSN of the publication (applies to journals - ie. periodical publications)|
|issue||y||y||Issue number of the journal that includes the article|
|keyword||y||y||an array of normalized and non-normalized keyword values associated with the record|
|keyword_facet||y||n||Contains list of keywords with the number of occurrences that keyword has for the search|
|keyword_norm||y||y||Controlled keywords, each entry will have a corresponding keyword_schema entry|
|keyword_schema||y||y||Schema for each controlled keyword, i.e., what was the origin of the keyword?|
|lang||y||y||In ADS this field contains a language of the main title. Currently, this value is present in a very small portion of records (try searching for lang:*)|
|links_data||y||y||y||We use it to contain info on what readable linked documents are available|
|nedid||y||y||List of NED IDs within a record|
|nedtype||y||y||Keywords used to describe the NED type (e.g. galaxy, star)|
|nedtype_object_facet_hier||y||n||Hierarchical facet consisting of NED object type and ID|
|orcid_other||y||y||ORCID claims from users who used the ADS claiming interface, but did not give us consent to show their profiles|
|orcid_pub||y||y||ORCID IDs supplied by publishers|
|orcid_user||y||y||ORCID claims from users who gave ADS consent to expose their public profiles.|
|page||y||y||First page of a record|
|page_count||y||y||If page_range is present, gives the difference between the first and last page numbers in the range|
|page_range||n||n||Range of page numbers covered by the record|
|property||y||y||an array of miscellaneous flags associated with the record. Possible values include: ARTICLE, REFEREED, NOT_REFEREED, INPROCEEDINGS, OPENACCESS, NONARTICLE, EPRINT, BOOK, PROCEEDINGS, CATALOG, SOFTWARE|
|pub||y||y||the canonical name of the publication the record appeared in|
|pub_raw||y||y||Name of publisher, but also includes the volume, page, and issue if exists|
|pubdate||y||y||publication date in the form YYYY-MM-DD (DD value will always be “00”) - May be interesting for people who want publication month|
|pubnote||n||y||Comments submitted with the arXiv version of the paper|
|read_count||y||y||number of times the record has been viewed within in a 90-day windows (ads and arxiv); len(readers)|
|reader||y||n||List of identifiers for people who have read the article|
|recid||y||y||Unique identifier of the document, Integer version of ‘id’ - this is more efficient for sorting, and range queries|
|reference||y||y||List of references inside a paper|
|simbad_object_facet_hier||y||y||The hierarchical facets consisting of object_type/object_id|
|simbid||y||y||List of SIMBAD IDs within the paper. This has privacy restrictions|
|simbtype||y||y||Keywords used to describe the SIMBAD type|
|title||y||y||the title of the record|
|vizier||y||y||Keywords, “subject” tags from VizieR|
|vizier_facet||y||y||Contains list of VizieR keywords with the number of occurences that keyword has for the search|
|volume||y||y||Volume of the journal that the article exists in|
|year||y||y||Year of publication|
|abs||y||n||Combination of the following: abstract, title, keyword|
|all||n||n||this combines the following: author_norm, alternate_title, bibcode, doi, identifier|
|arxiv||y||n||query parser token|
|citations()||n||y||y||returns list of citations from given papers; use
|citis()||y||y||-||Different implementation of citation(), less memory but slower|
|classic_relevance()||n||n||-||Toy-implementation of the ADS Classic relevance score algorithm. You can wrap any query and obtain the hits sorted in the ADS Classic ways (sort of)|
|full||y||n||this combines the following: title^2, abstract^2, body, keyword, ack|
|instructive()||y||y||n||Synonym of reviews()|
|joincitations()||y||y||-||Equivalent of citations() but implemented using lucene block-join|
|joinreferences()||y||y||-||Equivalent of references() but implemented using lucene block-join|
|orcid||y||n||this combined the following: orcid_pub, orcid_user, orcid_other|
|pos()||n||y||-||The pos() operator allows you to search for an item within a field by specifying the position in the field. The syntax for this operator is pos(fieldedquery,position,[endposition]). If no endposition is given, then it is assumed to be endposition = position, otherwise this performs a query within the range [position, endposition].|
|references()||n||y||y||returns list of references from given papers|
|reviews()||n||y||-||returns the list of documents citing the most relevant papers on the topic being researched; these are papers containing the most extensive reviews of the field.|
|reviews2()||y||-||n||Original implementation of reviews|
|topn()||n||y||-||Return the top N number of documents|
|trending()||n||y||-||Trending – returns the list of documents most read by users who read recent papers on the topic being researched; these are papers currently being read by people interested in this field.|
|useful()||n||y||-||Useful – returns the list of documents frequently cited by the most relevant papers on the topic being researched; these are studies which discuss methods and techniques useful to conduct research in this field.|
|useful2()||y||y||-||What experts are citing; original implementation of useful()|
|Field Name||Deprecated||Useful for user||Show/Give access? [y/n]|