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Geschke, A., Kortenkamp U., Lutz-Westphal B., & Materlik D.  (2005).\'a0\'a0Visage ? Visualization of Algorithms in Discrete Mathematics.  \ul Zentralblatt f\'fcr Didaktik der Mathematik. 37,\ul0  395-401.\par \par Kortenkamp, U., & Materlik D.  (2004).\'a0\'a0Geometry teaching in wireless classroom environments using Java and J2ME.  \ul Science of Computer Programming. 53,\ul0  71?85.\par \par Kortenkamp, U., & Materlik D.  (2004).\'a0\'a0Pen-based input of geometric constructions.  (Libbrecht, P., Ed.).\ul Proceedings of MathUI 2004. \ul0  \par \par Kortenkamp, U., & Materlik D.  (2004).\'a0\'a0Vernetztes Lehren und Lernen im Mathematikunterricht.  (Fellbaum, K., Rebensburg K., & Schwill A., Ed.).\ul Grundfragen multimedialen Lehrens und Lernens. Tagungsband des 2. Workshops GML2004. \ul0  \par \par }