Likharev B.K. (1974). Genus Omphalotrochus (Gastropoda) in the Upper Paleozoic of the USSR. Biostratigraficheskiy Sbornik [= Trudy VSEGEI. Vol 174]. 5: 205-218. [In Russian].
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Likharev B.K.
1974
Genus Omphalotrochus (Gastropoda) in the Upper Paleozoic of the USSR