Rong Zhao Jian-jie Zhao Fang Dai Feng-qun Zhao A new image secret sharing scheme to identify cheaters. 252-257 2009 31 Computer Standards & Interfaces 1 http://dx.doi.org/10.1016/j.csi.2007.10.012 db/journals/csi/csi31.html#ZhaoZDZ09