1. H. Schwenke, J. Knoth, in R.E. Van Grieken, A.A. Markowicz (Eds.), Handbook of X-ray Spectrometry. Methods and Techniques, Marcel Dekker, 1992.
2. M.J. Ellenhorn, D.G. Barcelou, Medical Toxicology. Diagnosis and treatment of Human Poisoning, Elsevier Science, 1988, p. 1048.
3. R.A. Goyer, in M.O. Amdur, J. Doull, C.D. Klaassen (Eds.), Casarett and Doull's Toxicology. The Basic Science of Poisons, McGraw-Hill, 1993, p. 646.
4. G. Kaiser, G. Todl, in O. Hutzinger (Ed.), The Handbook of Environmental Compounds, Vol. 3, Part A, Springer, Berlin, 1980, p. 1.
5. S. Mitra, Mercury in the Ecosystem, Aedermannsdorf, Switzerland, Trans Tech Publications Ltd., 1986.