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Tu, Shu-Fen, and Ching-Sheng Hsu. "A Joint Ownership Protection Scheme for Digital Images Based on Visual Cryptography." The International Arab Journal of Information Technology 9, no. 3 (2012).
Hsu, Ching-Sheng, and Shu-Fen Tu. Digital Watermarking Scheme with Visual Cryptography In International MultiConference of Engineers and Computer Scientists, IMECS 2008. Vol. I. Hong Kong, 2008.
Tu, Shu-Fen, and Ching-Sheng Hsu. "A BTC-Based Watermarking Scheme for Digital Images." Information & Security: An International Journal 15, no. 2 (2004): 216-228.