Xiaoshi Yin Xiangji Huang Zhoujun Li Promoting Ranking Diversity for Biomedical Information Retrieval Using Wikipedia. 495-507 2010 ECIR http://dx.doi.org/10.1007/978-3-642-12275-0_43 conf/ecir/2010 db/conf/ecir/ecir2010.html#YinHL10