Bruggen, A. C. van. (1994). Revisionary notes on Negulus O. Boettger, 1889, a genus of minute African land snails (Gastropoda Pulmonata: Vertiginidae). Zoologische Mededelingen. 68 (2): 5-20. Leiden.
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Bruggen, A. C. van
1994
Revisionary notes on <i>Negulus</i> O. Boettger, 1889, a genus of minute African land snails (Gastropoda Pulmonata: Vertiginidae)