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Groh, K., Alonso, M. R. & Ibáñez, M. (1993). Studies on Parmacella (Cryptella) from Fuerteventura and Lanzarote (Canary Islands) (Gastropoda Pulmonata: Parmacellidae). Archiv für Molluskenkunde, 121 [1990] (1/6): 125-141. Frankfurt am Main.
Groh, K., Alonso, M. R. & Ibáñez, M. (1993). Studies on Parmacella (Cryptella) from Fuerteventura and Lanzarote (Canary Islands) (Gastropoda Pulmonata: Parmacellidae). Archiv für Molluskenkunde, 121 [1990] (1/6): 125-141. Frankfurt am Main.