Abramian, M. S. (1974). Carboniferous System: Brachiopods, pp. 77-85, in:. Atlas iskopaemoi fauny Armyanskoi SSR (Atlas of the Fossil Fauna of the Armenian SSR). Erevan: Inst. Geol. Nauk Akad. Nauk Armyan. SSR.
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Abramian, M. S.
1974
Carboniferous System: Brachiopods, pp. 77-85, in:
Atlas iskopaemoi fauny Armyanskoi SSR (Atlas of the Fossil Fauna of the Armenian SSR)