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Kim, Cheonshik, YongSoo Choi, Hyoung-Joong Kim, Dongkyoo Shin, and Dongil; Shin. "Reversible Data Hiding for Halftone Images Using Histogram Modification." International Information Institute (Tokyo). Information; Koganei 16, no. 3 (2013): 1861-1872.
Kim, Cheonshik. "Data Hiding Based on BTC using EMD ." The Journal of The Institute of Internet, Broadcasting and Communication 14, no. 2: 11-16 .