Reference
Ewa Stworzewicz (2007): 2. Molluscan fauna (Gastropoda: Pulmonata: Pupilloidea): a systematic Review. In: Daxner-Höck, Gudrun ed. Oligocene-Miocene Vertebrates from the Valley of Lakes (Central Mongolia): Morphology, phylogenetic and stratigraphic implications – Annalen des Naturhistorischen Museums in Wien – 108A: 25 - 41.