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Gusev, A. K. (1963). Znacheniye dvustvorchatykh mollyuskov dlya raschleneniya i korrelyatsii krasnotsvetnykh otlozheniy verkhney permi vostoka Russkoy platformy [Significance of bivalves for stratification and correlation of the red beds of the Upper Permian of the eastern Russian Platform]. Uchenyye zapiski Kazanskogo universiteta. 123(5): 15-25.
Gusev, A. K. (1963). Znacheniye dvustvorchatykh mollyuskov dlya raschleneniya i korrelyatsii krasnotsvetnykh otlozheniy verkhney permi vostoka Russkoy platformy [Significance of bivalves for stratification and correlation of the red beds of the Upper Permian of the eastern Russian Platform]. Uchenyye zapiski Kazanskogo universiteta. 123(5): 15-25.