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Author (up) Title Year Publication Serial Volume Pages
Clark, B. African wild ass 1982 Oryx 2260 17 28-31
Ryder, O.A. Przewalski's horse – putting the wild horse back in the wild 1988 Oryx 1537 22 154-157
Schaller, G.B: The Mountain Gorilla: Ecology and Behaviour. 1964 Oryx 5149 7 253-254