Jiangtao Ren Zhengyuan Qiu Wei Fan Hong Cheng Philip S. Yu Forward Semi-supervised Feature Selection. 970-976 2008 PAKDD http://dx.doi.org/10.1007/978-3-540-68125-0_101 conf/pakdd/2008 db/conf/pakdd/pakdd2008.html#RenQFCY08