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Spannagel, C., & Kortenkamp U.  (2009).\'a0\'a0Demonstrating, Guiding, and Analyzing Processes in Dynamic Geometry Systems.  (Bardini, C., Fortin C., Oldknow A., & Vagost D., Ed.).\ul Proceedings of the 9th International Conference on Technology in Mathematics Teaching. \ul0  \par \par }