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Maassen, W. J. M. (1991). Helicodonta gyria wilhelminae nov. subspec. von der griechischen Insel Kreta (Gastropoda Pulmonata: Helicidae). Basteria. 55(4/6): 123-126. Leiden [29 November].
Maassen, W. J. M. (1991). Helicodonta gyria wilhelminae nov. subspec. von der griechischen Insel Kreta (Gastropoda Pulmonata: Helicidae). Basteria. 55(4/6): 123-126. Leiden [29 November].
