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Stworzewicz, E. (2007). Molluscan fauna (Gastropoda: Pulmonata: Pupilloidea): a systematic Review. In: Daxner-Höck, G. (Ed.) Oligocene-Miocene Vertebrates from the Valley of Lakes (Central Mongolia): Morphology, phylogenetic and stratigraphic implications. Annalen des Naturhistorischen Museums in Wien. 108A (2006), 25-41.