Jia Liu Chun Chen Jiajun Bu Mingyu You Jianhua Tao Speech Emotion Recognition using an Enhanced Co-Training Algorithm. 999-1002 2007 ICME http://dx.doi.org/10.1109/ICME.2007.4284821 conf/icmcs/2007 db/conf/icmcs/icme2007.html#LiuCBYT07