@book{550291,
	author = {Ladener, Heinz.},
	title = {Solaranlagen :},
	publisher = {Ökobuch,},
	year = {1993.},
	address = {Staufen bei Freiburg :},
	edition = {2. Aufl.},
	url = {http://www.archive.org/details/solaranlagenplan00lade}
}