Peng Liu Jiaxian Zhu Lanjuan Liu Yanhong Li Xuefeng Zhang Application of Feature Selection for Unsupervised Learning in Prosecutors' Office. 35-38 2005 conf/fskd/2005-2 FSKD (2) http://dx.doi.org/10.1007/11540007_5 db/conf/fskd/fskd2005-2.html#LiuZLLZ05