@article {7191,
	title = {Die in Mitteleuropa kultivierten und verwilderten Aster- und Helianthusarten nebst einem Schl{\"u}ssel zur Bestimmung derselben. Allg},
	journal = {Bot. Zeitschr},
	volume = {19},
	year = {1913},
	month = {1913///},
	pages = {87 - 89},
	author = {A. Thellung}
}
@article {7192,
	title = {Erigeron huelsenii. Ein neuer Bastart aus der Posener Flora. {\"O}ster},
	journal = {Bot. Zeitschr},
	volume = {21},
	year = {1871},
	month = {1871///},
	pages = {346 - 347},
	author = {G. Vatke}
}
@article {7193,
	title = {Beitrag zur Kenntnis der Gattung Rumex. {\"O}ster},
	journal = {Bot. Zeitschr},
	volume = {42},
	year = {1892},
	month = {1892///},
	pages = {17 - 20},
	author = {K. Rechinger}
}
