Johnson, J. G.; Blodgett, R. B. (1993). Russian Devonian Brachiopod Genera Cyrtinoides and Komiella in North America. Journal of Paleontology. 67(6): 952-958.
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Johnson, J. G.; Blodgett, R. B.
1993
Russian Devonian Brachiopod Genera Cyrtinoides and Komiella in North America