1. A. F. Vadyunina and V. F. Babanin, “Magnetic susceptibility of some USSR soils,” Pochvovedenie 10, 55–66 (1972).
2. A. P. Vinogradov, Geochemistry of Rare and Trace Chemical Elements in Soils (Acad. Sci. USSR, Moscow, 1957) [in Russian].
3. Y. N. Vodyanitskii, Soil Pollution with Heavy Metals and Metalloids and Their Environmental Hazard (Analytical Review) (Moscow State Univ., Moscow, 2017) [in Russian].
4. Soil-geographical zoning and structure of the soil cover of the Perm region;T. V. Vologzhanina,1982
5. N. F. Ganzhara, B. A. Borisov, and R. F. Baibekov, Workshop on Soil Science (LLC Reart, Moscow, 2017) [in Russian].