@book{49156,
	author = {Biehler, Rolf. and ebrary, Inc.},
	title = {Didactics of mathematics as a scientific discipline},
	publisher = {Kluwer Academic Publishers,},
	year = {c1994.},
	series = {Mathematics education library ;},
	address = {Dordrecht ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10067432}
}