1. Anderson, PD, Weber LJ (1975) The toxicity of aquatic populations of mixtures containing certain heavy metals. In: Proceedings of the International Conference on Heavy Metals in the Environment Canada 27–31. University of Toronto, Toronto Institute of Environmental Studies, 933–953.
2. APHA, AWWA, WPCP (1975) Standard method for the examination of water and wastewater, 14th Ed., American Public Health Association, New York.
3. Blaylock, BC, Erank ML (1979) A comparison of the toxicity of nickel to the developing eggs and larvae of carp (Cyprinus carpio). Bull Environ Contam Toxicol 21: 604–611.
4. European Inland Fisheries Advisory Commission (1980) Report on the combined effects on freshwater fish and other aquatic life of mixtures of toxicants in water. EIEAC Technical Paper No. 37, Food and Agriculture Organization of the United Nations, Rome.
5. Khangarot BS (1981) Lethal effects of zinc and nickel on freshwater teleosts. Acta Hydrochim Hydrobiol 9: 297–302.