1. Shu Lin, Daniel J. Costello jr., “Error Control Coding: Fundamentals and Applications”, Prentice Hall, 1983.
2. D. Kahn, “The Codebreakers”, Macmillan, New York, 1967, pp. 523.
3. Friedrich Bauer, “Kryptologie: Methoden und Maximen”, Springer-Verlag Berlin, 1993, pp. 5–20.
4. A.W. Gruen, “Adaptive Least Squares Correlation: A powerful image matching technique”, Report Number 115 of the Institute for Geodesy and Photogrammetry, ETH Zürich, 1986.
5. William K Pratt, “Correlation Techniques of Image Registration”, IEEE Transactions on aerospace and electronic systems, vol AES-10, no 3, May 1974.