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| Author | Title  |
Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Tizard I. | An introduction to veterinary immunology. | 1987 | 6000 | |||
| DOBRORUKA LJ et al, | An analysis of the population of Grevy's zebra | 1987 | 1018 | 26 | 290-293 | |
| Harrington, F.H. | Aggressive howling in wolves | 1987 | Anim Behav | 6457 | 35 |