Sattarian, A. (2006, juni 26). Contribution to the biosystematics of Celtis L. (Celtidaceae) with special emphasis on the African species. WUR Wageningen UR (142 pag.) Prom. Prof. dr. ir. L.J.G. van der Maesen.
Sina, S. (2006, maart 8). Reproduction et diversité Génétique chez Parkia biglobosa (Jacq.) G. Don, WUR Wageningen UR (102 pag. Prom. Prof.dr. ir. L.J.G. van der Maesen.
Adomou, A.K. (2005, september 21). Vegetation patterns and environmental gradients in Benin. WUR Wageningen UR
(133 pag.) (Wageningen). Prom./coprom.: .
Tchouto Mbatchou, G.P. (2004, februari 23). Plant diversity in a central African rain forest, implications for biodiversity conservation in Cameroon. WUR Wageningen UR (210 pag.) (Wageningen: [s.n.]). Prom./coprom.: Prof dr ir L.J.G. van der Maesen, Prof dr A.M. Cleef, & Dr W.F. de Boer.