Jian Zhao Mingquan Zhou Hongmei Xie Jinye Peng Xin Zhou A Novel Wavelet Image Watermarking Scheme Combined with Chaos Sequence and Neural Network. 663-668 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3174&spage=663 2004 conf/isnn/2004-2 ISNN (2) db/conf/isnn/isnn2004-2.html#ZhaoZXPZ04