Hsieh, Ching-Tang, Yeh-Kuang Wu, and Kuo-Ming Hung. “Hybrid Watermarking Scheme for Halftone Images ”. International Journal of Advanced Science and Technology 1 (November 30, 2008): 09 - 20. Accessed July 24, 2026. http://sersc.org/journals/index.php/IJAST/article/view/2.