Zhicheng Dou Kun Chen Ruihua Song Yunxiao Ma Shuming Shi 0001 Ji-Rong Wen Microsoft Research Asia at the Web Track of TREC 2009. 2009 TREC http://trec.nist.gov/pubs/trec18/papers/microsoft-asia.WEB.pdf conf/trec/2009 db/conf/trec/trec2009.html#DouCSMSW09