Betekhtina O.A. (1974). Biostratigrafiya i korrelyatsiya uglenosnykh otlozhenii pozdnego paleozoya po nemorskim dvustvorkam (Biostratigraphy and Correlation of the Carboniferous Beds of the Late Paleozoic Based on Nonmarine Bivalves). Novosibirsk, Nauka Publishers. 181 p. [in Russian].
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Betekhtina O.A.
1974
Biostratigrafiya i korrelyatsiya uglenosnykh otlozhenii pozdnego paleozoya po nemorskim dvustvorkam (Biostratigraphy and Correlation of the Carboniferous Beds of the Late Paleozoic Based on Nonmarine Bivalves)