The Biology of large African mammals in their environment : proceedings of a symposium held at the Zoological Society of London on 19th and 20th May, 1988 / edited by P.A. Jewell and G.M.O. Maloiy. - Jewell, Peter Arundel.; Maloiy, G. M. O. (Symposia of the Zoological Society of London, 1989)