Gusev, A. (1969). Printsipy i kriterii sistematiki pozdnepaleozoyskikh (nemorskikh) dvustvorchatykh mollyuskov SSSR [Principles and criteria for the systematics of late Paleozoic (non-marine) bivalves of the USSR]. Soveshchaniye po probleme "Puti i zakonomernosti istoricheskogo razvitiya zhivotnykh i rastitel'nykh organizmov" [Meeting on the problem "Paths and patterns of historical development of animal and plant organisms"]. Tezisy Dokladov, Sektsiia Dvustvorchatykh Molliuskov. Paleontological Institute, Moscow, pp. 34-37.