1. Kochen, M., Adaptive mechanisms in digital “concept” processing, in The growth of knowledge, Kochen, M., Ed., John Wiley, New York, 1967.
2. Carnap, R. and Bar-Hillel, Y., An outline of a theory of semantic information. Technical Report No. 247, Research Laboratory of Electronics, Massachusetts Institute of Technology, 1952.
3. Whittemore, B. and Yovits, M., A generalized conceptual development for the analysis and flow of information. Journal of the American Society for Information Science, 24, 221, 1973.
4. Ibid, p.225.