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... [Materials of the Conference on the Inland Waters of the Baltic Region], Limnologiya, 2 (1968), 111. [6] M. l. Ivanov, Mikrobiologija, 2 (1955), 14. [7] S. I. Kuznetsov, W. I. Romanienko, Mikrobiologicheskoye izuchenie vnutrennikh vodoyemov ...