Verdcourt, B. (1957). A key to the East African species of the section Plicigulella Pilsbry of the fenus Gulella Pfr. (Moll., Streptaxidae). Revue de Zoologie et de Botanique Africaine, 55: 125-131.
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Verdcourt, B.
1957
A key to the East African species of the section Plicigulella Pilsbry of the fenus Gulella Pfr. (Moll., Streptaxidae)