@inbook {1007,
	title = {{\textquoteleft}Practicing place value{\textquoteright}: How children interpret and use virtual representations and features},
	booktitle = {Proceedings of the Eleventh Congress of the European Society for Research in Mathematics Education },
	year = {2019},
	pages = {2941-2948},
	publisher = {Freudenthal Group \& Freudenthal Institute, Utrecht University and ERME},
	organization = {Freudenthal Group \& Freudenthal Institute, Utrecht University and ERME},
	address = {Utrecht, the Netherlands},
	author = {Schulz, Axel and Walter, Daniel},
	editor = {Jankvist, U. T. and van den Heuvel-Panhuizen, M. and Veldhuis, M.}
}
@inbook {884,
	title = {{\"A}sthetische-mediale Zugangsweisen zu Bilderb{\"u}chern {\textendash} Kinder gestalten am Computer},
	booktitle = {Durch Bilder bilden: empirische Studien zur didaktischen Verwendung von Bildern im Vor- und Grundschulalter},
	year = {2009},
	pages = {151-161},
	publisher = {Baltmannsweiler},
	organization = {Baltmannsweiler},
	address = {Schneider-Verlag Hohengehren},
	author = {Leinigen, Andreas},
	editor = {Lieber, G. and Jahn, I. and Danner, A.}
}
