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Trgalova, J., Kortenkamp U., Jahn A P., Libbrecht P., Mercat C., Recio T., et al.  (2011).\'a0\'a0I2Geo.net ? a platform for sharing dynamic geometry resources all over Europe.  \ul \ul0  \par \par Libbrecht, P., Kortenkamp U., & Mercat C.  (2010).\'a0\'a0Crossing Cultural Boundaries with Long Term Interactive Geometry Resources.  \ul \ul0  \par \par Ab\'e1nades, M., Botana F., Escribano J., Hendriks M., Kortenkamp U., Kreis Y., et al.  (2009).\'a0\'a0The Intergeo File Format in Progress.  \ul Proceedings of the 22nd OpenMath Meeting. \ul0  \par \par Ab\'e1nades, M., Botana F., Escribano J., Hendriks M., Kortenkamp U., Kreis Y., et al.  (2009).\'a0\'a0The Intergeo File Format in Progress.  \ul Proceedings of the 22nd OpenMath Meeting. \ul0  \par \par Kortenkamp, U., Blessing A. M., Dohrmann C., Kreis Y., Libbrecht P., & Mercat C.  (2009).\'a0\'a0Interoperable Interactive Geometry For Europe ? First Technological and Educational Results and Future Challenges of the Intergeo Project.  \ul Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). \ul0  \par \par Kortenkamp, U., Blessing A. M., Dohrmann C., Kreis Y., Libbrecht P., & Mercat C.  (2009).\'a0\'a0Interoperable Interactive Geometry For Europe ? First Technological and Educational Results and Future Challenges of the Intergeo Project.  \ul Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). \ul0  \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., & Richter-Gebert J.  (2004).\'a0\'a0Using Automatic Theorem Proving to Improve the Usability of Geometry Software.  (Libbrecht, P., Ed.).\ul Proceedings of MathUI 2004. \ul0  \par \par }