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Azuma, Y. & Azuma, M. (1991). Description of a New Fossil Subspecies of the Genus Nesiohelix Kuroda & Emura, 1943 (Pulmonata: Bradybaenidae) from Kita-Daitojima Island, Eastern Okinawa, Japan. Venus (Japanese Journal of Malacology). 50 (3): 181-183.
Azuma, Y. & Azuma, M. (1991). Description of a New Fossil Subspecies of the Genus Nesiohelix Kuroda & Emura, 1943 (Pulmonata: Bradybaenidae) from Kita-Daitojima Island, Eastern Okinawa, Japan. Venus (Japanese Journal of Malacology). 50 (3): 181-183.