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4. T. T. Efremova, “Humus Status Parameters of Peat Soils,” Biol. Nauki, No. 10, 102–108 (1983).
5. T. T. Efremova, “Pedogenesis and Diagnostics of Peat Soils in Bog Ecosystems,” Pochvovedenie, No. 12, 25–35 (1992).