Sidnev, A.V. (1976). Novyye vidy mollyuskov
Crassiana praecrassoides i
Potomida baschkirica iz akchagylskikh otlozheniy doliny r. Karmasan [New species of mollusks,
Crassiana praecrassoides and
Potomida baschkirica, from the Akchagylian deposits of the valley of the river Karmasan]. In: Yakhimovich, V.L. (Ed.), Stratigrafiya i korrelyatsiya pliotsena i pleystotsena Preduralʹya. BFAN SSSR, Ufa, pp. 26–34.