1. Multimedia data-embedding and watermarking technologies
2. Agman, S.: ‘Hadamard matrices and their applications’, Lecture Notes in Mathematics, no. 1168, (Springer Verlag Berlin 1980)
3. Phase watermarking of digital images
4. The University of Waterloo Fractal Compression Project (Waterloo BragZone) available at http://links.uwaterloo.ca/bragzone.base.html