@article {283,
	title = {Flore et v{\'e}g{\'e}tation de la for{\^e}t naturelle de Nyungwe, Rwanda},
	journal = {Systematics and Geography of Plants},
	volume = {71},
	year = {2001},
	pages = {1009-1015},
	author = {Ewango, C.E.N.}
}
@article {109,
	title = {Revision of the African genus <i>Annickia</i> (Annonaceae)},
	journal = {Systematics and Geography of Plants},
	volume = {77},
	year = {2007},
	pages = {91-118},
	url = {http://www.ingentaconnect.com/content/nbgb/sgp/2007/00000077/00000001/art00005 },
	author = {Versteegh, P. C. and Sosef, Marc S. M}
}
