In: Vaclav Skala (Hrsg.). WSCG 2007 Short Paper Proceedings. International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG-2007), 15th, January 29 - February 1, Plzen-Bory, Czech Republic, Pages 125-132, ISBN 978-80-86943-02-2, UNION Agency - Science Press, Plzen, Czech Republic, 2007.