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Kortenkamp, U., & Laborde C.  (2011).\'a0\'a0Interoperable Interactive Geometry for Europe: an introduction.  \ul ZDM ? The International Journal on Mathematics Education. \ul0  1-3.\par \par Kortenkamp, U.  (2008).\'a0\'a0Math Unit Testing ? A New Approach to the Use of Technology in Teaching.  (Laborde, C., Ed.).\ul \ul0  \par \par }