1. Beth, T.: Die Allgemeine Diskrete Fourier Transformation, (Teubner, Stuttgart to be published
2. Beth, T.: Stream ciphers, CISM Lecture Notes, to be published
3. Lipson, J.D.: Elements of algebra and algebraic computing, (Addison-Wesley, Reading, MA 1981)
4. Macwilliams, F.J., and Sloane, N.J.A.: The theory of error-correcting codes, Amsterdam, North-Holland 1978)