pdf dblp UALR at TREC-ENT 2007 Hemant Joshi | Sithu D. Sudarsan | Subhashish Duttachowdhury | Chuanlei Zhang | Srini Ramaswamy Proceedings of The Sixteenth Text REtrieval Conference, TREC 2007, Gaithersburg, Maryland, USA, November 5-9, 2007