Nikiforova, O. (1937). Brachiopoda of the Cambrian and Silurian Systems of U.S.S.R. Central geol. Prospect. Inst., Palaeont. U.S.S.R. Monographs. 35( fasc. 1): 69-84.
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Nikiforova, O.
1937
Brachiopoda of the Cambrian and Silurian Systems of U.S.S.R.
Central geol. Prospect. Inst., Palaeont. U.S.S.R. Monographs