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2. P. K. Anokhin, Biology and Neurophysiology of the Conditioned Reflex and Its Role in Adaptive Behavior (Pergamon, Oxford, 1974).
3. K. V. Sudakov, General Theory of Functional Systems (Meditsina, Moscow, 1984) [in Russian].
4. E. H. Rosch, “Natural categories,” Cognit. Psychol. 4, 328–350 (1973).
5. Principles of categorization;E. Rosch,1978