Maoqiang Xie Jinli Liu Nan Zheng Dong Li Yalou Huang Yang Wang Semi-Supervised Graph-Ranking for Text Retrieval. 256-263 2008 AIRS http://dx.doi.org/10.1007/978-3-540-68636-1_25 conf/airs/2008 db/conf/airs/airs2008.html#XieLZLHW08