@article {7071,
	title = {Zum Vorkommen und zur Verbreitung der Kugeldistel-Gattung Echinops in Oberfranken},
	journal = {Ber. Naturforsch. Ges. Bamberg},
	volume = {66},
	year = {1991},
	month = {1991///},
	pages = {17 - 44},
	author = {E. Walter}
}
@article {7072,
	title = {Zur Ausbreitung der Knollen-Sonnenblume oder Topinambur (Helianthus tuberosus L.) in Oberfranken},
	journal = {Ber. Naturforsch. Ges. Bamberg},
	volume = {67},
	year = {1992},
	month = {1992///},
	pages = {37 - 57},
	author = {E. Walter}
}
@article {7073,
	title = {Zur Verbreitung der Behaarten Karde (Dipsacus pilosus L.) und der Schlanken Karde (Dipsacus strigosus Willd. ex Roemer et Schultes) in Oberfranken},
	journal = {Ber. Naturforsch. Ges. Bamberg},
	volume = {65},
	year = {1990},
	month = {1990///},
	pages = {25 - 61},
	author = {T. Helfrich and W. Lohwasser}
}
