Yikai Fang Jian Cheng Jinqiao Wang Kongqiao Wang Jing Liu Hanqing Lu Hand posture recognition with co-training. 1-4 2008 ICPR http://dx.doi.org/10.1109/ICPR.2008.4761066 conf/icpr/2008 db/conf/icpr/icpr2008.html#FangCWWLL08