Xiangwei Kong Rufeng Chu Xiaohui Ba Ting Zhang Deli Yang A Perception Evaluation Scheme for Steganography. 426-430 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2690&spage=426 2003 conf/ideal/2003 IDEAL db/conf/ideal/ideal2003.html#KongCBZY03