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Betekhtina, O. A. (1977). Tipy zakhoroneniy podnepermskikh nemorskikh dvustvorchatykh mollyuskov i metodika ikh ispol'zovaniya dlya detal'noy biostratigrafii i korrelyatsii [The types of ensevelissment Late Permian non-marine bivalves and its utilization for detail biostratigraphy and correlation]. Trudy Instituta geologii i geofiziki SO AN SSSR. 360: 23–37.
Betekhtina, O. A. (1977). Tipy zakhoroneniy podnepermskikh nemorskikh dvustvorchatykh mollyuskov i metodika ikh ispol'zovaniya dlya detal'noy biostratigrafii i korrelyatsii [The types of ensevelissment Late Permian non-marine bivalves and its utilization for detail biostratigraphy and correlation]. Trudy Instituta geologii i geofiziki SO AN SSSR. 360: 23–37.
