J. - P.  Ghogue, Sonké, B., and Couvreur, T. L. P., ?Taxonomic revision of the African genera \textit{Brieya and \textit{Piptostigma (Annonaceae)?, Plant Ecology and Evolution, vol. 150, pp. 173?216, 2017.

J. - P.  Ghogue, Sonké, B., and Couvreur, T. L. P., ?Taxonomic revision of the African genera Brieya and Piptostigma (Annonaceae)?, Plant Ecology and Evolution, vol. 150, no. 2, 2017.