1. O. N. Bakhmet and S. A. Shoba, “Morphological and biochemical features of organic profiles of forest soils of Karelia,” Lesovedenie, No. 3, 74–79 (2006).
2. L. G. Bogatyrev, “Classification of forest litters,” Pochvovedenie, No. 3, 118–127 (1990).
3. L. G. Bogatyrev, “Formation of forest litter as one of the major processes in forest ecosystems,” Eurasian Soil Sci. 29, 459–468 (1996).
4. L. G. Bogatyrev and V. M. Telesnina, Dictionary of Terms and Indices Used for Analysis of Biological Cycle, Ed. by A. S. Vladychenksii (MAKS Press, Moscow, 2010) [in Russian].
5. A. P. Vinogradov, “Average contents of chemical elements in major types of igneous rocks of the Earth’s crust,” Geokhimiya, No. 7, 555–571 (1962).