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:

trending(exoplanets)

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:

useful("galaxy surveys")

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:

reviews("weak lensing")

will return a ranked list of papers featuring reviews of weak gravitational lensing and its cosmological implications.

diagram showing use of the second order operators
Usage of the trending( ), useful( ), and reviews( ) smart operators


TopN – returns the list of top N documents for a user defined query, where they are ordered by their default sort order or a user specified sort order. For example:

topn(100, database:astronomy, citation_count desc)

will return the top 100 most cited astronomy papers.

This next example uses the default sort order for the interior query, so no sort order needs to be specified:

trending(topn(10, reviews("weak lensing")))

This query returns papers currently being read by users who are interested in the field of weak lensing.