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Gusev, A. K. (1990). Nemorskiye dvustvorchatyye mollyuski verkhney permi Yevropeyskoy chasti SSSR [Upper Permian non-marine bivalves of the European part of the USSR]. Izdatel'stvo Kazanskogo universiteta, Kazan, 295 pp.
Gusev, A. K. (1990). Nemorskiye dvustvorchatyye mollyuski verkhney permi Yevropeyskoy chasti SSSR [Upper Permian non-marine bivalves of the European part of the USSR]. Izdatel'stvo Kazanskogo universiteta, Kazan, 295 pp.
