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Henriquez, F. C., Ibáñez, M.; Alonso, M. R. (1993). Revision of the genus Napaeus Albers , 1850 (Gastropoda Pulmonata: Enidae). The problem of Napaeus (Napaeinus) nanodes (Shuttleworth, 1852) and description of five new species from its conchological group. Journal of Molluscan Studies. 59: 147-163. London.
Henriquez, F. C., Ibáñez, M.; Alonso, M. R. (1993). Revision of the genus Napaeus Albers , 1850 (Gastropoda Pulmonata: Enidae). The problem of Napaeus (Napaeinus) nanodes (Shuttleworth, 1852) and description of five new species from its conchological group. Journal of Molluscan Studies. 59: 147-163. London.