S. Dandapat, S. Sarkar, and A. Basu. International Conference on Computational Intelligence, page 169-172. International Computational Intelligence Society, (2004)
C. Vielhauer, T. Basu, J. Dittmann, and P. Dutta. Security, Steganography, and Watermarking of Multimedia Contents, volume 5681 of Proceedings of SPIE, page 504-515. SPIE, (2005)