Reference

Folco Giusti, Giuseppe Manganelli (1985): Notulae Malacologicae, XXXIII. "Helix" sororcula Benoit 1859 and its relationships to the genera Vallonia Risso and Planogyra Morse (Pulmonata: Pupilloidea).1) – Archiv für Molluskenkunde116: 157 - 181.

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