@inbook {454,
	title = {Winkel in der Sekundarstufe I {\textendash} Sch{\"u}lervorstellungen erforschen},
	booktitle = {Geometrie zwischen Grundbegriffen und Grundvorstellungen},
	year = {2015},
	pages = {29-42},
	publisher = {Springer Verlag},
	organization = {Springer Verlag},
	address = {Berlin},
	url = {http://link.springer.com/book/10.1007/978-3-658-06835-6},
	author = {Christian Dohrmann and Ana Kuzle},
	editor = {Andreas Filler and Anselm Lambert}
}
