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Ladel, S., & Kortenkamp U.  (2011).\'a0\'a0Finger-Symbol-Sets and Multi-Touch for a better understanding of numbers and operations.  \ul Proceedings of CERME 7, Rzeszow. \ul0  \par \par Kortenkamp, U., & Fest A.  (2008).\'a0\'a0From CAS/DGS Integration to Algorithms in Educational Math Software.  \ul Proceedings of ATCM 08. \ul0  \par \par Kortenkamp, U.  (2001).\'a0\'a0The future of mathematical software.  \ul Proceedings of MTCM 2000. \ul0  \par \par Kortenkamp, U.  (2000).\'a0\'a0Foundations of Dynamic Geometry.  \ul Journal f\'fcr Mathematikdidaktik. 21,\ul0  161?162.\par \par Kortenkamp, U.  (1999).\'a0\'a0Foundations of Dynamic Geometry.  \ul \ul0  \par \par }