@book {8609,
	title = {{\"O}kologie der gew{\"a}sserbegleitenden Agriophyten Angelica archangelica ssp. Litoralis, Bidens frondosa und Rorippa austriaca im Ruhrgebiet},
	year = {1999},
	month = {1999///},
	publisher = {Diss. Bot. 321},
	organization = {Diss. Bot. 321},
	author = {P. Keil}
}
