@article {KorDoh-duo-2011,
	title = {多触摸{\textquoteright}{\textquoteright}使用者界面的几何教育意义分析},
	journal = {数学教学},
	number = {4},
	year = {2011},
	keywords = {lehrer},
	author = {Kortenkamp, Ulrich and Dohrmann, Christian}
}
