@conference {721,
	title = {Digitale Medien und Darstellung im Mathematikunterricht - Schriftlichkeit und M{\"u}ndlichkeit},
	booktitle = {fraMediale 2011},
	year = {2011},
	publisher = {kopaed},
	organization = {kopaed},
	address = {Frankfurt},
	author = {Schreiber, Christof}
}
