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CLAYTON HM et al,. (1981). Some studies of comparative aspects of sexual behaviour in ponies and donkeys. App Anim Ethol, 7, 169–174.
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Keiper Rr, B. J. (1982). Refuge – seeking and pest avoidance by feral horses in desert and island environments. App Anim Ethol, 9, 111–120.
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Ruckebusch Y,. (1975). The hypnogram as an index of adaptation of farm animals to changes in their environment. App Anim Ethol, 2, 3–18.
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