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Hamilton, W. D. (1964). The genetical evolution of social behaviour. I. J. Theor. Biol., 7(1and 2), 1–52.
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Schaller, G. B.:. (1964). The Mountain Gorilla: Ecology and Behaviour. Oryx, 7(05), 253–254.
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Fisher, J. (1964). The Natural History of Aggression.
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Solomatin Ao,. (1964). The reproduction and behaviour by onager. Bull M O va isp Prirodi OTD Biol, 69, 71–82.
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Goodall J. (1964). Tool-using and aimed throwing in a community of free-living chimpanzees. Nature, 201, 1264.
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Erz W,. (1964). Tooth eruption and replacement in Burchell's Zebra. Arnoldia, 1, 1–8.
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Klingel, H. (1964). Zur Sozialstruktur des Steppenzebras, Equus quagga boehmi Matschie. Die Naturwissenschaften, 51(14), 347.
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Ebhardt H,. (1964). Zusammenhänge zwischen Zahnbau, Zahnstellung und Kieferbau bei Pferde-Unterkiefern. Säugetierk Mitt, 12, 145–155.
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