1. L. V. Aleshchukhin, “Transformation and forms of metal accumulation in tundra soils of the European north,” in Natural and Anthropogenically Changed Biochemical Cycles, Tr. Biogeokhim. Lab., Ed. by V. V. Dobrovol’skii and N. I. Konova (Nauka, Moscow, 1990), Vol. 21, pp. 72–83 [in Russian].
2. V. V. Bakulin and V. V. Kozin, Geography of Tyumen Oblast (Sredneural’sk. Knizhn. Izd., Yekaterinburg, 1996) [in Russian].
3. O. N. Bakhmet, “Organic profile as an integral indicator of natural conditions,” in Proceedings of IV All-Russian Scientific Conference with International Participation on Forest Soil Science “Ecological Functions of Forest Soils in Natural and Disturbed Landscapes” (Apatity, 2011), Part 2, pp. 74–77 [in Russian].
4. A. A. Beus, L. I. Grabovskaya, and N. V. Tikhonova, Geochemistry of Environment (Nedra, Moscow, 1976) [in Russian].
5. R. R. Brooks, Biological Methods of Prospecting for Minerals (Wiley, New York, 1983; Nedra, Moscow, 1986).