@article {540,
	title = {Der Botanische Garten der Universitat zu Halle im Jahre 1799},
	volume = {1},
	year = {1801},
	author = {Sprengel}
}
@article {438,
	title = {Systema vegetabilium [Caroli Linnaei ... ]. Editio decima sexta},
	volume = {3},
	year = {1826},
	author = {Sprengel}
}
@article {314,
	title = {Neue Entdeckungen im ganzen Umfang der Pflanzenkund},
	volume = {2},
	year = {1821},
	author = {Sprengel}
}
@article {332,
	title = {Novi Proventus Horortum Academicorum Halensis et Berolinensis. Halae [Halle]},
	year = {1818},
	author = {Sprengel}
}
