Term-specific smoothing for the language modeling approach to information retrieval: the importance of a query term.

Djoerd Hiemstra Term-specific smoothing for the language modeling approach to information retrieval: the importance of a query term. 35-41 2002 conf/sigir/2002 SIGIR http://doi.acm.org/10.1145/564376.564385 db/conf/sigir/sigir2002.html#Hiemstra02