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Zatravkin M.N. (1983). Unio kalmykorum of the Oka river and the system of the genus Unio in the European part of the USSR. Zoologicheskiy Zhurnal. 62(10): 1577-1580. [In Russian].
Zatravkin M.N. (1983). Unio kalmykorum of the Oka river and the system of the genus Unio in the European part of the USSR. Zoologicheskiy Zhurnal. 62(10): 1577-1580. [In Russian].
