1. V. N. Beklemishev and I. A. Chetyrkina, “Biology of Flood. The Destin of Earthworms during the Spring Flood,” in Problems in Ecology and Biocenology (OGIZ, Leningrad, 1935), issue 1, pp. 120–136 [in Russian].
2. Quantitative Methods in Soil Zoology, Ed. by B. R. Gilyarov and B. R. Striganova (Nauka, Moscow, 1987) [in Russian].
3. P. Duchaufour, Precis de pedologie, Masson and Cie, Paris, 1965, 2nd ed.; Duchaufour, P., L’evolution des sols, Masson and Cie, Paris, 1968.
4. I. K. Lopatin, Basic Zoogeography (Vysheishaya Shkola, Minsk, 1980) [in Russian].
5. A. E. Magguran, Ecological Diversity and Its Measurement, London: Croom Helm, 1988.