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Betekhtina, O. A. (1983). O predelakh izmenchivosti i filogenii nemorskikh dvustvorchatykh mollyuskov pozdnego paleozoya [On the limits of variability and phylogeny of non-maine bivalves of the late Paleozoic]. In: Morfologiya i sistematika bespozvonochnykh fanerozoya [Morphology and systematics of Phanerozoic Invertebrata]. Akademiya Nauk SSSR, Sibirskoye Otdeleniye, Trudy Instituta Geologii i Geofiziki [Academy of Sciences of USSR, Siberian Branch, Transactions of the Institute of Geology and Geophysics]. 538: 5-14. Nauka, Moskva.
Betekhtina, O. A. (1983). O predelakh izmenchivosti i filogenii nemorskikh dvustvorchatykh mollyuskov pozdnego paleozoya [On the limits of variability and phylogeny of non-maine bivalves of the late Paleozoic]. In: Morfologiya i sistematika bespozvonochnykh fanerozoya [Morphology and systematics of Phanerozoic Invertebrata]. Akademiya Nauk SSSR, Sibirskoye Otdeleniye, Trudy Instituta Geologii i Geofiziki [Academy of Sciences of USSR, Siberian Branch, Transactions of the Institute of Geology and Geophysics]. 538: 5-14. Nauka, Moskva.
