@article {8132,
	title = {Het geslacht Corispermum in Nederland},
	journal = {Nederl. Kruidk. Arch.},
	volume = {51},
	year = {1941},
	month = {1941///},
	pages = {442 - 450},
	author = {S.E. De Jongh and J.L. van Soest}
}
@article {7660,
	title = {Die fremden Bidens-Arten in Mitteleuropa},
	journal = {Feddes Repert., Beiheft},
	volume = {131},
	year = {1941},
	month = {1941///},
	pages = {42 - 93},
	author = {A. Schumacher}
}
