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3. R. O. Butovskii, “Heavy Metals as Technogenic Chemical Contaminants and Their Toxicity for Soil Invertebrates,” Agrokhimiya, No. 4, 73–91 (2005).
4. Yu. N. Vodyanitskii, Study of Heavy Metals in Soils (Moscow, 2005) [in Russian].
5. Yu. N. Vodyanitskii, A. A. Vasil’ev, M. N. Vlasov, and V. V. Korovushkin, “Role of Fe in the Fixation of Heavy Metals and As in Alluvial and Podzolic Soils in the Perm’ Region,” Pochvovedenie (in press).