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Verdcourt, B. (1962). Preliminary keys for the identification of the species of Gulella Pfr. occurring in East Africa. Annales du Musée Royal de l'Afrique centrale, Tervuren, [sciences zoologiques] No 106: 1–39, plus 5 plates.
Verdcourt, B. (1962). Preliminary keys for the identification of the species of Gulella Pfr. occurring in East Africa. Annales du Musée Royal de l'Afrique centrale, Tervuren, [sciences zoologiques] No 106: 1–39, plus 5 plates.
