H. H. Du Preez

The development of an aquatic toxicity index as a tool in the operational management of water quality in the Olifants River (Knsger National Park)

Victor Wepener, Norbert Euler, V. Wepener, 1992 .

Acute toxicity tests of copper on juvenile Mozambique tilapia, Oreochromis mossambicus (Cichlidae), at different temperatures

J.H.J. van Vuren, H. H. Du Preez, Gail Nussey, 1996 .