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| Author | Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Harlow, H.F. | Learning and satiation of response in intrinsically motivated complex puzzle performance by monkeys | 1950 | Journal of Comparative and Physiological Psychology | 6550 | 43 | 289-294 |
| Willemse Mca, | The shifting of the molar row with regard to the orbit in equus and giraffa | 1950 | 1708 | 30 | 311-326 | |
| Imanishi K, | Social life of semi | 1950 | 1212 | 4 | 29-42 | |
| Bourdelle Me, F.S. | La classification des equides actuels | 1950 | 965 | 14 | 126-139 | |
| Antonius. O., | Fruchtbare Maultiernachzucht | 1950 | Zool Anzeiger Erg | 893 | 28-33 | |
| Antonius. O., | Beobachtungen an Einhufern in Schönbrunn. XIX. Ein Waldzebra | 1950 | Zoologische Garten | 892 | 17 | 204-210 |