Tao Qin Tie-Yan Liu Xu-Dong Zhang Guang Feng Wei-Ying Ma Subsite Retrieval: A Novel Concept for Topic Distillation. 388-400 2005 conf/airs/2005 AIRS http://dx.doi.org/10.1007/11562382_30 db/conf/airs/airs2005.html#QinLZFM05