Ljaschenko, A. I. (1973). Brachiopods and stratigraphy of the Lower Frasnian beds of southern Timan and the Volga–Ural oil-and-gas-bearing province. Tr. Vsesoyuzn. Nauchno-Issled. Geol. Nedt. Inst. 134: 1-278.
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Ljaschenko, A. I.
1973
Brachiopods and stratigraphy of the Lower Frasnian beds of southern Timan and the Volga–Ural oil-and-gas-bearing province