T. L. P.  Couvreur, Botermans, M., van Heuven, B. J., and Van der Ham, R. W. J. M., ?Pollen morphology within the Monodora clade, a diverse group of five African Annonaceae genera?, GranaGrana, vol. 47, pp. 185-210, 2008.

M.  Botermans, Sosef, M. S. M., Chatrou, L. W., and Couvreur, T. L. P., ?A revision of the African genus Hexalobus (Annonaceae)?, Systematic BotanySystematic Botany, vol. 36, pp. 33-48, 2011.

T. L. P.  Couvreur, Botermans, M., van Heuven, B. J., and Van der Ham, R. W. J. M., ?Pollen morphology within the Monodora clade, a diverse group of five African Annonaceae genera?, Grana, vol. 47, pp. 185-210, 2008.

M.  Botermans, Sosef, M. S. M., Chatrou, L. W., and Couvreur, T. L. P., ?A revision of the African genus Hexalobus (Annonaceae)?, Systematic Botany, vol. 36, no. 1, pp. 33-48, 2011.

T. L. P.  Couvreur, Botermans, M., van Heuven, B. J., and Van der Ham, R. W. J. M., ?Pollen morphology within the Monodora clade, a diverse group of five African Annonaceae genera?, Grana, vol. 47, pp. 185-210, 2008.