1. Yu. N. Blagoveshchenskii, E. A. Dmitriev, and V. P. Samsonova, Nonparametric Methods in Soil Science (Mosk. Gos. Univ., Moscow, 1985) [in Russian].
2. L. G. Bogatyrev, “Some Theoretical Aspects of Forest Litter Study,” Lesovedenie, No. 4, 17–19 (2004).
3. E. F. Vedrova, “Organic Matter Decomposition in Forest Litters,” Pochvovedenie, No. 2, 17–29 (1997) [Eur. Soil Sci. 30 (2), 181–188 (1997)].
4. B. V. Gnedenko, Yu. K. Belyaev, and A. D. Solov’ev, Mathematical Methods in the Theory of Reliability (Nauka, Moscow, 1965) [in Russian].
5. O. P. Dobrodeev and N. V. Popova, “The Dependence of Litter Reserves on Thermal Conditions,” Pochvovedenie, No. 12, 1437–1438 (2000) [Eur. Soil Sci. 33 (12), 1263–1264 (2000)].