1. A method, comprising: 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 distinct name of a respective author; receiving a query that specifies a particular name of a particular author; generating a result list of one or more documents that satisfy the query, the documents being ranked according to a document rank; ranking the one or more first document groups based on a respective count of documents in the result list that are included in each of the one or more first document groups; and providing data describing the one or more first document groups in response to the query, wherein the one or more first document groups are presented in an order according to the ranking.