@book{50845,
	author = {Ploeg, J. Van Der.},
	title = {A revision of isonema R. Br. and Pycnobotrya Bent (Apocynaceae},
	publisher = {Veenaman & Zonen,},
	year = {1983},
	series = {Mededelingen Landbouwhogeschool Wageningen Nederland},
	address = {Wageningen :}
}