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Sergeeva, M. T. (1980). Zonal'noye raschleneniye srednego i verkhnego karbona Donbassa i korrelyatsiya s razrezami Zapadnoy Yevropy po nemorskim dvustvorkam mollyuskam [Zonal division of the Middle and Upper Carboniferous of Donbass and correlation with sections of Western Europe based on non-marine bivalves]. Tektonika i stratigrafiya. 19: 96-101.
Sergeeva, M. T. (1980). Zonal'noye raschleneniye srednego i verkhnego karbona Donbassa i korrelyatsiya s razrezami Zapadnoy Yevropy po nemorskim dvustvorkam mollyuskam [Zonal division of the Middle and Upper Carboniferous of Donbass and correlation with sections of Western Europe based on non-marine bivalves]. Tektonika i stratigrafiya. 19: 96-101.
