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A.C. van Bruggen and J.L. Goethem (1998)

Dr William Adam’s iconography of Central and West African Gulella species (Gastropoda Pulmonata : Streptaxidae). Part 2 : Gulella (Wilmattina) guilielmi, a new species from the eastern D.R. Congo.

Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, 68:43-46.