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2. Domanitskii A.P., Dubrovina, R.G. and Isaeva, A.I., Rivers and Lakes of the Soviet Union, Leningrad: Gidrometeoizdat, 1971 [in Russian].
3. State Water Cadastre. Resources of Surface Waters of the USSR, Leningrad: Gidrometeoizdat, 1965–1978, Vols. 1–20 [in Russian].
4. State Water Register. URK: http://www.textual.ru/gvr/(Accessed January 20, 2016).
5. Ryanzhin, S.V., How Many Lakes Are There on the Earth? Priroda, 2005, no. 4, pp. 18–25 [in Russian].