@book {RicKor-CMWWIGS-2011,
	title = {The Cinderella.2 Manual {\textendash} Working with the Interactive Geometry Software},
	year = {2012},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	keywords = {software},
	author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}
}
