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Isakova, T. N.; Nazarov, B. B. (1986). Stratigrafiya i mikrofauna pozdnego karbona-rannej permi Yuzhnogo Urala. Akademiya Nauk SSSR, Trudy Instituta Geologicheskikh NaukAkademiya Nauk SSSR, Trudy Instituta Geologicheskikh Nauk. 402, Nauka, Moscow (In Russian).