de Vos, J.M. and Breteler, F.J. (2009) “A REVISION OF THE AFRICAN GENERA PAROPSIOPSIS AND SMEATHMANNIA (PASSIFLORACEAE – PAROPSIEAE), INCLUDING A NEW SPECIES OF PAROPSIOPSIS FROM CAMEROON”, Edinburgh Journal of Botany, 66(1), pp. 27–49. doi:10.1017/S0960428609005174.