@article {5664,
	title = {Aperture Types within Sapranthus and Polyalthia (Annonaceae)},
	journal = {Plant Systematics and EvolutionPlant Systematics and Evolution},
	volume = {161},
	number = {3-4},
	year = {1988},
	pages = {135-146},
	author = {Waha, M. and Hesse, M.}
}
