Bruggen, A. C. van; Van Goethem, J. L. (1999). Dr William Adam's iconography of Central and West African Gulella species (Gastropoda Pulmonata: Streptaxidae). Part 3: nine new species from the C.R. Congo. Bulletin de l'Institute Royal des Sciences Naturelles de Belgique, Biologie. 96: 31-45.
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Bruggen, A. C. van; Van Goethem, J. L.
1999
Dr William Adam's iconography of Central and West African <i>Gulella</i> species (Gastropoda Pulmonata: Streptaxidae). Part 3: nine new species from the C.R. Congo
Bulletin de l'Institute Royal des Sciences Naturelles de Belgique, Biologie