Yiming Yang Abhimanyu Lad Ni Lao Abhay Harpale Bryan Kisiel Monica Rogati Utility-based information distillation over temporally sequenced documents. 31-38 2007 conf/sigir/2007 SIGIR http://doi.acm.org/10.1145/1277741.1277750 db/conf/sigir/sigir2007.html#YangLLHKR07