1. L. N. Aleksandrova, Soil Organic Matter and Its Transformation (Nauka, Leningrad, 1980) [in Russian].
2. Soil Atlas of the Komi Republic, Ed. by G. V. Dobrovolskii, A. I. Taskaev, and I. V. Zaboeva (Komi Resp. Tipogr., Syktyvkar, 2010) [in Russian].
3. Atlas of Climate and Hydrology of the Komi Republic, Ed. by A. I. Taskaev (Drofa, Moscow, 1997) [in Russian].
4. R. S. Vasilevich, V. A. Beznosikov, and E. D. Lodygin, “Molecular structure of humus substances in permafrost peat mounds in forest-tundra,” Eurasian Soil Sci. 52, 283–295 (2019).
5. D. N. Gabov, R. S. Vasilevich, E. V. Yakovleva, and O. M. Zueva, “Aromatic compounds in peatlands of permafrost area,” Geoekol. Inzh. Geol. Gidrogeol. Geokriol., No. 6, 15–29 (2017).