@book {9783830988571, 
	title = "Tablet-PCs im Mathematikunterricht der Klasse 6",
	isbn = "9783830988571",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783830988571",
	url = "https://content-select.com/de/portal/media/view/5c868571-6af4-4c12-91e2-2fb3b0dd2d03",
	publisher = "Waxmann Verlag",
}