Olivier, Robert Charles DaCres, On the ecology of the Asian elephant : elephas maximus linn. with particular reference to Malaya and Sri Lanka / by Robert Charles Dacres Olivier.. - Cambridge, Eng. : University of Cambridge, 1978 - 2v. : illustrations ; 30 cm. Thesis (Ph.D.). University of Cambridge, 1978 p. 437-454 Subjects--Topical Terms: Elephants--Environmental aspects.