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Kortenkamp, U., Blessing A. M., Dohrmann C., Kreis Y., Libbrecht P., & Mercat C.  (2009).  Interoperable Interactive Geometry For Europe ? First Technological and Educational Results and Future Challenges of the Intergeo Project.  Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France).  

Kortenkamp, U., Blessing A. M., Dohrmann C., Kreis Y., Libbrecht P., & Mercat C.  (2009).  Interoperable Interactive Geometry For Europe ? First Technological and Educational Results and Future Challenges of the Intergeo Project.  Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France).  

Kortenkamp, U., Dohrmann C., Kreis Y., & Dording C.  (2009).  Using the Intergeo Platform for Teaching and Research.  (Bardini, C., Fortin C., Oldknow A., & Vagost D., Ed.).Proceedings of the 9th International Conference on Technology in Mathematics Teaching.  

Kortenkamp, U., Dohrmann C., Kreis Y., & Dording C.  (2009).  Using the Intergeo Platform for Teaching and Research.  (Bardini, C., Fortin C., Oldknow A., & Vagost D., Ed.).Proceedings of the 9th International Conference on Technology in Mathematics Teaching.