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Antonius. O.,. (1950). Beobachtungen an Einhufern in Schönbrunn. XIX. Ein Waldzebra. Zool. Garten., 17, 204–210.
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Antonius. O.,. (1950). Fruchtbare Maultiernachzucht. Zool Anzeiger Erg, , 28–33.
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Bourdelle Me, F. S. (1950). La classification des equides actuels. Mammalia, 14, 126–139.
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Imanishi K,. (1950). Social life of semi. Physiol & Ecol Japan, 4, 29–42.
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Willemse Mca,. (1950). The shifting of the molar row with regard to the orbit in equus and giraffa. Zool Mededelingen, 30, 311–326.
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Harlow, H. F. (1950). Learning and satiation of response in intrinsically motivated complex puzzle performance by monkeys. J Comp Physiol Psychol, 43(4), 289–294.
Abstract: Two rhesus monkeys, given 60 two-hour sessions with a six-device mechanical puzzle showed clear evidence of learning, the curve showing ratio of incorrect to correct responses appearing quite comparable to similar curves obtained during externally rewarded situations. When, on the thirteenth day of tests, the subjects were presented with the puzzle 100 times at 6-minute intervals, the number of devices manipulated decreased regularly throughout the day, although there was no significant change in the number of times the problem assembly was attacked.
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