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Jatsuk [= Yatsuk], N. E. (1979). Ekostratigrafiya pogranichnykh gorizontov vorkutskoy serii pechorskogo basseyna [Ecostratigraphy of the boundary horizons of the Vorkuta Group of the Pechora Basin]. In: Betekhtina, O. A.; Zhuravleva, I. T. (eds) Sreda i zhizn' v geologicheskom proshlom. Voprosy ekostratigrafii [Environment and Life in the Geological Past: Questions of Ecostratigraphy]. Trudy Instituta Geologii i Geofiziki. 431: 68-75.
Jatsuk [= Yatsuk], N. E. (1979). Ekostratigrafiya pogranichnykh gorizontov vorkutskoy serii pechorskogo basseyna [Ecostratigraphy of the boundary horizons of the Vorkuta Group of the Pechora Basin]. In: Betekhtina, O. A.; Zhuravleva, I. T. (eds) Sreda i zhizn' v geologicheskom proshlom. Voprosy ekostratigrafii [Environment and Life in the Geological Past: Questions of Ecostratigraphy]. Trudy Instituta Geologii i Geofiziki. 431: 68-75.
