1. R. Kh. Aidinyan, Extraction of Clay from Soils: Brief Instruction (Giprovodkhoz, Moscow, 1960) [in Russian].
2. A. L. Alexandrovskiy and E. I. Aleksandrovskaya, Soil Evolution and the Geographical Environment (Nauka, Moscow, 2005) [in Russian].
3. S. A. Alekseeva, T. Ya. Dronova, and T. A. Sokolova, “Chemical and mineralogical characteristics of podzolic and bog-podzolic soils developed from two-layered deposits in the Central Forest State Biospheric Reserve,” Moscow Univ. Soil Sci. Bull. 62, 140–148 (2007).
4. I. I. Vasenev and V. O. Targulian, Windfall and Taiga Pedogenesis (Nauka, Moscow, 1995) [in Russian].
5. I. V. Zaboeva, Soils and Land Resources of the Komi Autonomous SSR (Komi Knizhn. Izd., Syktyvkar, 1975) [in Russian].