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Parametrische Oberflächen mit GeoGebra5 (Kurvenschichtung )
parametrische Oberflächen__ Kurvenschichtung
Zugang zu den ggb files auf: http://www.umtriebe.de
http://www.geogebratube.org/material/show/id/53042
video: http://www.youtube.com/user/Michailroman