Xiaoling Sun 0002 Yuan Lin 0001 Hongfei Lin Zhihao Yang DUTIR at TREC 2008 Relevance Feedback Track. 2008 TREC http://trec.nist.gov/pubs/trec17/papers/dalianu.blog.pdf conf/trec/2008 db/conf/trec/trec2008.html#SunLLY08