1. A. D. Voronin, Basics of Soil Physics (Mosk. Gos. Univ., Moscow, 1986) [in Russian].
2. V. V. Ivanov, Ecological Geochemistry of Elements: Ecogeochemistry of Rare Elements (Ekologiya, Moscow, 1995) [in Russian].
3. Methodological Recommendations for Assessing the Contamination of Urban Soils and Snow Cover with Heavy Metals (Moscow, V.V. Dokuchaev Soil Institute, 1999) [in Russian].
4. Methodological Recommendations for the Field and Laboratory Studies of Soils and Plants in the Control of Environmental Contamination with Metals, Ed. by N. G. Zyrin and S. G. Malakhov (Gidrometeoizdat, Moscow, 1981) [in Russian].
5. OAO Mosenergo Official Site, http://www.mosenergo.ru .