Smirnova, T. N.; Zezina, O. N.; Popiel-Barczyk, E. (1983). On the shell structure, morphogenesis and distribution of the megathyrids (Brachiopoda). Paleontologicheskiy Zhurnal. 2: 45-53.
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Smirnova, T. N.; Zezina, O. N.; Popiel-Barczyk, E.
1983
On the shell structure, morphogenesis and distribution of the megathyrids (Brachiopoda)