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[2] Feigenbaum E. А.: Аn Infoгmation Processing Theory of Verbal Learning. RАND Corp. Paper P-1817, 1959.

[3] Feigenbaum E. А., Simon H. А.: Generalization of an Elementary Perceiving and Memorizing Machine. Pp. 401-406 in C.M. Popplewell (Ed.). Information Processing 1962. North Holland Publ. Comp., Аmsterdam 1963.

[4] Copi I. M.: Introduction to Logic. The Macmillan Comp., New York 1961.