@book {RicKor-IGSC-1999,
	title = {The Interactive Geometry Software Cinderella},
	year = {1999},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	address = {Heidelberg},
	keywords = {software},
	url = {http://cinderella.de},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}
}
