Okapi at TREC-5.

@inproceedings{hancockbeaulieu-1996-okapi, author = {Micheline Hancock-Beaulieu and Mike Gatford and Xiangji Huang and Stephen E. Robertson and Steve Walker and P. W. Williams}, editor = {Ellen M. Voorhees and Donna K. Harman}, title = {{Okapi at TREC-5}}, booktitle = {{Proceedings of The Fifth Text REtrieval Conference, TREC 1996, Gaithersburg, Maryland, USA, November 20-22, 1996}}, series = {NIST Special Publication}, volume = {500-238}, publisher = {National Institute of Standards and Technology (NIST)}, year = {1996}, url = {http://trec.nist.gov/pubs/trec5/papers/city.procpaper.ps.gz} }