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Author  |
Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Boyd, L. | Behavior problems of equids in zoos | 1986 | The Veterinary clinics of North America. Equine practice | 660 | 2 | 653-664 |
| Kiley, M. | The vocalizations of ungulates, their causation and function | 1972 | Zeitschrift für Tierpsychologie | 681 | 31 | 171-222 |