@conference {1403,
	title = {Learning to rank documents for ad-hoc retrieval with regularized models},
	booktitle = {SIGIR 2007 workshop on Learning to Rank for Information Retrieval},
	year = {2007},
	pdf = {http://rali.iro.umontreal.ca/rali/sites/default/files/publis/Mixture.camera_ready\%5B1\%5D.pdf},
	author = {Cao, Guihong and Jian-Yun Nie and Si, Luo and Bai, Jing}
}
