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Mazaev A.V. (2015). Upper Kazanian (Middle Permian) gastropods of the Volga–Urals Region. Paleontological Journal. 49(8): 869-986.
Mazaev A.V. (2015). Upper Kazanian (Middle Permian) gastropods of the Volga–Urals Region. Paleontological Journal. 49(8): 869-986.