1. L. Friberg, G. F. Nordberg, B. Vouk,Handbook on the Toxicology of Metals, Elsevier, North Holland, Amsterdam, 1979.
2. E. Merian, V. Geldmacher, M. Mallinckrodt, G. Machata, H. W. N�rnberg, H. Schlipkoter, W. Stumm,Metalle in der Umwelt, Verlag Chemie, Weinheim, 1984.
3. A. Vercruysse,Hazardous Metals in Human Toxicology, Elsevier, Amsterdam, 1984.
4. K. W. Bruland, in:Chemical Oceanography, 2nd Ed. (J. P. Riley R. Chester, eds.), Academic Press, London, 1983, pp. 157.
5. E. E. Carry, in:Biological and Environmental Aspects of Chromium, Chapt. 3. E (S. Lagrand, ed.), Sevier Biomedical Press, Amsterdam, 1982.