Seng, W. C., L. L. Fong, N. L. Shing, and S. A. Hosseini Noudeh. “Robust Watermarking Using Hand Gesture for Enhanced Authentication”. Malaysian Journal of Computer Science, vol. 24, no. 2, Mar. 2011, pp. 98-110, https://jupidi.um.edu.my/index.php/MJCS/article/view/6548.