PEP | Read - Yerkes, Robert M: Genetic aspects of grooming, a socially important primate behaviour pattern. Journ. of soc. psychology, IV, 1, 1933. S. 3-25.

Hermann, I. (1933) Yerkes, Robert M: Genetic aspects of grooming, a socially important primate behaviour pattern. Journ. of soc. psychology, IV, 1, 1933. S. 3-25.. Imago 19:430-432

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