Methods, systems, and apparatus, including computer programs encoded on computer storage media, for associating resources with entities. One of the methods includes clustering a plurality of first documents into one or more first document groups, wherein each of the one or more first document groups is associated with a proper name of an author; receiving a query that specifies a particular proper name of a particular author; generating a result list of one or more documents that satisfy the query, the documents being listed in order of rank; ranking the one or more first document groups based on the one or more documents that satisfy the query; and providing the one or more first document groups, wherein the one or more first document groups are presented in an order based on the ranking.