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Zykin, V.S. (1979). Stratigrafiya i unionidy pliotsena yuga Zapadno-Sibirskoy ravniny [Stratigraphy and unionids of the Pliocene of the South of the West Siberian Plain]. Nauka, Novosibirsk, 135 pp.
Zykin, V.S. (1979). Stratigrafiya i unionidy pliotsena yuga Zapadno-Sibirskoy ravniny [Stratigraphy and unionids of the Pliocene of the South of the West Siberian Plain]. Nauka, Novosibirsk, 135 pp.