Isao Echizen Takaaki Yamada Satoru Tezuka Stephan Singh Hiroshi Yoshiura Improved Video Verification Method Using Digital Watermarking. 445-448 2006 conf/iih-msp/2006 IIH-MSP http://doi.ieeecomputersociety.org/10.1109/IIH-MSP.2006.122 db/conf/iih-msp/iih-msp2006.html#EchizenYTSY06