Nicholas J. Belkin Diane Kelly G. Kim Ja-Young Kim Hyuk-Jin Lee Gheorghe Muresan Muh-Chyun (Morris) Tang Xiao-Jun Yuan Colleen Cool Query length in interactive information retrieval. 205-212 2003 conf/sigir/2003 SIGIR http://doi.acm.org/10.1145/860435.860474 db/conf/sigir/sigir2003.html#BelkinKKKLMTYC03