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Adam, W.; Van Goethem, J. L. (1978). Revision du sous-genre Parennea Pilsbry du genre Ptychotrema Mörch (Mollusca-Pulmonata-Streptaxidae). Études du Continent Africain. 5: 1-79.
Adam, W.; Van Goethem, J. L. (1978). Revision du sous-genre Parennea Pilsbry du genre Ptychotrema Mörch (Mollusca-Pulmonata-Streptaxidae). Études du Continent Africain. 5: 1-79.
