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Komulainen, S.F: & al.: Assessing the Environmental Conditions of Rivers on the Northern Coast of Lake Ladoga by Chemical Characteristics and the Structure of Hydrobiocenoses. Water Resources, 2016, 43. vsk, nro 3, s. 486–494. Pleiades Publishing. ISSN 0097-8078ResearchGate. (PDF) Viitattu 12.1.2022. (englanniksi)