@booklet {RicKor-GEI-1997,
	title = {Geometry and education in the {I}nternet age},
	year = {1997},
	publisher = {ETH Z{\"u}rich},
	type = {Gr{\"u}ne Berichte},
	keywords = {invited},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}
}
