1. Berkeley, E. C.: Giant Brains. Wiley. New York. 1949.
2. Shannon, C., and Weaver, W.: The Mathematical Theory of Communication. University of Illinois Press. Urbana. 1949.
3. pp. 35, 99 and 109.
4. Wiener, N.: Cybernetics. Wiley. New York. 1948.
5. , pp. 26ff.