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4. Pravdin, I.F., Sigi vodoemov Karelo-Finskoi SSR (Whitefish of Reservoirs of the Karelo-Finnish SSR), Moscow: Akad. Nauk SSSR, 1954.
5. Svärdson, G., The coregonid problem: VI. The Palearctic species and their intergrades, Report of the Institute of Freshwater Research, Drottningholm, 1957, pp. 267—356.