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2. G. M. Kashulina, Aerotechnogenic Transformation of Soils in the European Subarctic Region (Kola Science Center, Russian Academy of Sciences, Apatity, 2002), Parts 1–2.
3. G. M. Kashulina, V. N. Pereverzev, and T. I. Litvinova, “Transformation of the soil organic matter under the extreme pollution by emissions of the Severonikel smelter,” Eurasian Soil Sci. 43(10), 1174–1183 (2010).
4. Classification and Diagnostic System of Russian Soils (Oikumena, Smolensk, 2004) [in Russian].
5. K. N. Manakov and V. V. Nikonov, Biological Cycle of Mineral Elements and Soil Formation in Spruce Forests of Extreme North (Nauka, Leningrad, 1981) [in Russian].