1. Chem. Soc. Spec. Publ.;G Barnes,1977
2. Beijer, K. and Jernelov, A. (1979). In Topics in Environmental Health, vol. 3, The Biogeochemistry of Mercury in the Environment, ed. J. O. Nriagu. Elsevier North-Holland Biomedical Press, Amsterdam
3. Bielecki, E. (1977). Acta Biol. Cracov. Sér. Bot., 20, 67
4. Brown, G. I. (1961). A Simple Guide to Modern Valency Theory. Longmans, London
5. Byford, W. J. (1978). Ann. Appl. Biol., 88, 377