1. Gabaidullin, A.G., Il’ina, E.M., Ryzhov, V.V., and Khamitova, R.Ya., Okhrana okruzhayushchei sredy ot rtutnogo zagryazneniya (Protection of Environment against Mercury Contamination), Kazan: Magarif, 1999.
2. Biester, H., Müller, G., and Schöler, H.F., Sci. Total Environ., 2002, vol. 284, p. 191.
3. Han, Y.H., Kingston, M., and Boylan, H.M., Anal. Bioanal. Chem., 2003, vol. 375, p. 428.
4. Kabata-Pendias, A. and Pendias, H., Trace Elements in Soils and Plants, Boca Raton: CRS, 1985.
5. GN (Hygienic Norms) 2.1.7.2041-06: Maximum Permissible Concentrations (MPCs) of Chemical Substances in Soil.