Bruggen, A. C. van. (1996). Studies on the Streptaxidae (Mollusca, Gastropoda, Pulmonata) of Malawi. 4. A review of the subgenus Plicigulella of the genus Gulella in Malawi. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. 98(4): 329–341.
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Bruggen, A. C. van
1996
Studies on the Streptaxidae (Mollusca, Gastropoda, Pulmonata) of Malawi. 4. A review of the subgenus <i>Plicigulella</i> of the genus <i>Gulella</i> in Malawi.
Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen