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Kortenkamp, U., & Kreis Y.  (2010).\'a0\'a0Konstruktionsbeschreibungen und DGS.  \ul Beitr\'e4ge zum Mathematikunterricht. Vortr\'e4ge auf der 44. Tagung f\'fcr Didaktik der Mathematik in M\'fcnchen. \ul0  501-504.\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., Dohrmann C., Kreis Y., & Dording C.  (2009).\'a0\'a0Using the Intergeo Platform for Teaching and Research.  (Bardini, C., Fortin C., Oldknow A., & Vagost D., Ed.).\ul Proceedings of the 9th International Conference on Technology in Mathematics Teaching. \ul0  \par \par Kortenkamp, U., Dohrmann C., Kreis Y., & Dording C.  (2009).\'a0\'a0Using the Intergeo Platform for Teaching and Research.  (Bardini, C., Fortin C., Oldknow A., & Vagost D., Ed.).\ul Proceedings of the 9th International Conference on Technology in Mathematics Teaching. \ul0  \par \par Kortenkamp, U., & Kreis Y.  (2008).\'a0\'a0Intergeo ? Interoperable Interactive Geometry for Europe.  \ul Beitr\'e4ge zum Mathematikunterricht. Vortr\'e4ge auf der 42. Tagung f\'fcr Didaktik der Mathematik in Budapest. \ul0  \par \par Kortenkamp, U., & Kreis Y.  (2008).\'a0\'a0Intergeo ? Interoperable Interactive Geometry for Europe.  \ul Beitr\'e4ge zum Mathematikunterricht. Vortr\'e4ge auf der 42. Tagung f\'fcr Didaktik der Mathematik in Budapest. \ul0  \par \par }