@book { 4412,
	title = {Alte und neue Birnensorten : Kulturgeschichte - Anbau - Sorten},
	publisher = {Obst- und Gartenbauverl.},
	year = {1991},
	series = {},
	note = {Ill.},
	author = {Mühl, , Franz and Beuchert, , Marianne}
}