1. Yu. S. Bykov, Theory of Speech Intelligibility in Communication Lines [in Russian], Oboronizdat, Moscow (1954).
2. M. Mesarovic, D. Macko, and Y. Takahara, Theory of Hierarchical Multilevel Systems [Russian translation], Mir, Moscow (1973).
3. D. A. Pospelov (ed.), Artificial Intelligence [in Russian], Vol. 2, Models and Methods: A Handbook, Radio i Svyaz’, Moscow (1990).
4. C. Shannon, Works on the Theory of Information and Cybernetics [Russian translation], Izd. Inostr. Lit., Moscow (1963).
5. G. G. Belonogov and A. P. Novoselov, Automation of Processes of Information Accumulation, Retrieval, and Generalization [in Russian], Nauka, Moscow (1979).