1. T. V. Afanas’eva, V. I. Vasilenko, T. V. Tereshina, and B. V. Sheremet, Soils of USSR (Mysl’, Moscow, 1979) [in Russian].
2. N. I. Bazilevich, Biological Productivity of Northern Eurasian Ecosystems (Nauka, Moscow, 1993) [in Russian].
3. A. V. Belikovich, Vegetation Cover of the Northern Part of the Koryak Highlands (Dal’nauka, Vladivostok, 2001) [in Russian].
4. A. V. Belikovich, A. V. Galanin, A. A. Galanin, O. D. Tregubov, et al., Nature and Resources of Chukotka (Sev.-Vost. Nauchn. Tsentr. Dal’nevost. Otd. Ross. Akad. Nauk, Magadan, 2006) [in Russian].
5. V. G. Gagarin, “Review of the fauna of free-living nematodes in water bodies of the Arctic and Subarctic of Russia,” Biol.Vnutr. Vod, No. 2, 32–37 (2001).