Azbel, A. Y. (1989). Zonal subdivision of the Middle and Upper Oxfordian of the Russian Platform - foraminiferal zonation of the Middle and Upper Oxfordian of the Russian Platform. Межведомственный стратиграфический комитет СССР. Труды - Mezhvedomstvennyi Stratigraficheskii Komitet SSSR Trudy. 19: 44-62, 109-158.
336446
Azbel, A. Y.
1989
Zonal subdivision of the Middle and Upper Oxfordian of the Russian Platform - foraminiferal zonation of the Middle and Upper Oxfordian of the Russian Platform
Межведомственный стратиграфический комитет СССР. Труды - Mezhvedomstvennyi Stratigraficheskii Komitet SSSR Trudy