1. A. P. Vinogradov, Geochemistry of Rare and Scattered Chemical Elements in Soils (Academy of Sciences of the USSR, Moscow, 1957) [in Russian].
2. VMDU-87: Temporal Maximum Permissible Concentrations of Some Chemical Elements and Gossypol in Fodders and Food Additives for Livestock (Moscow, 1987) [in Russian].
3. Yu. N. Vodyanitskii, “Zinc forms in soils (review of publications),” Eurasian Soil Sci. 43, 269–277 (2010).
4. GN 2.1.7.2041-06: Maximum Permissible Concentrations (MPCs) of Chemical Substances in Soil (Moscow, 2006) [in Russian].
5. GN 2.1.7.2511-09: Tentative Permissible Concentrations (TPCs) of Chemical Substances in Soil (Moscow, 2009) [in Russian].