SIGIR'04 - Session IIb: Formal models - 1 A formal study of information retrieval heuristics Hui Fang Tao Tao Chengxiang Zhai Discriminative models for information retrieval Ramesh Nallapati Probabilistic model for contextual retrieval Ji-Rong Wen Ni Lao Wei-Ying Ma Return to SIGIR'04 Sessions ©2005 Association for Computing Machinery