Clusters, language models, and ad hoc information retrieval.

Oren Kurland Lillian Lee Clusters, language models, and ad hoc information retrieval. 2009 27 ACM Trans. Inf. Syst. 3 http://doi.acm.org/10.1145/1508850.1508851 db/journals/tois/tois27.html#KurlandL09