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Giusti, F. & Manganelli, G. (1986). Notulae Malacologicae, XXXIII. “Helix” sororcula Benoit 1859 and its relationships to the genera Vallonia Risso and Planogyra Morse (Pulmonata: Pupilloidea). Archiv für Molluskenkunde. 116 [1985] (4/6): 157-181. Frankfurt am Main [18 April].
Giusti, F. & Manganelli, G. (1986). Notulae Malacologicae, XXXIII. “Helix” sororcula Benoit 1859 and its relationships to the genera Vallonia Risso and Planogyra Morse (Pulmonata: Pupilloidea). Archiv für Molluskenkunde. 116 [1985] (4/6): 157-181. Frankfurt am Main [18 April].
