1. 1) Kac, M.: Probability and Related Topics in Physical Sciences. New York (1959).
2. 2) Kimura, M.: Mathematical Theory of Genetics. Iwanami-Koza, Gendai- Oyo-Sugaku, Tokyo (1957) (in Japanese).
3. 3) Mckean, H. P. Jr.: Speed of approach to equilibrium for Kac's caricature of Maxwellian gas. Arch. Rational Mech. Anal., 21, 343-367 (1966).
4. 4) Volterra, V.: Lecons sur la théorie mathématique de la lutte pour la vie. Cahiers scientifiques. VII. Paris, Gauthier-Villas (1931).