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Ladel, S., & Kortenkamp U.  (2012).\'a0\'a0Early maths with multi-touch ? an activity-theoretic approach.  \ul Proceedings of POEM 2012. \ul0  \par \par Bescherer, C., Herding D., Kortenkamp U., M\'fcller W., & Zimmermann M.  (2012).\'a0\'a0E-learning Tools with Intelligent Assessment and Feedback.  (Graf, S., Lin F., Kinshuk, & McGreal R., Ed.).\ul Intelligent and Adaptive Learning Systems: Technology Enhanced Support for Learners and Teachers. \ul0  \par \par El-Demerdash, M., & Kortenkamp U.  (2009).\'a0\'a0The Effectiveness of an Enrichment Program Using Dynamic Geometry Software in Developing Mathematically Gifted Students' Geometric Creativity.  (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.  (2005).\'a0\'a0Experimentieren und Publizieren.  (Bender, P., Herget W., Weigand H-G., & Weth T., Ed.).\ul WWW und Mathematik - Lehren und Lernen im Internet, Tagungsband der 21. Arbeitstagung des Arbeitskreis Mathematikunterricht und Informatik in Dillingen/Donau. \ul0  120-126.\par \par Kortenkamp, U.  (2004).\'a0\'a0Experimental mathematics and proofs ? what is secure mathematical knowledge?.  \ul Zentralblatt f\'fcr Didaktik der Mathematik. 36,\ul0  61?66.\par \par Richter-Gebert, J., & Kortenkamp U.  (2000).\'a0\'a0Euklidische und nicht-Euklidische Geometrie in Cinderella.  \ul Journal f\'fcr Mathematikdidaktik. 22,\ul0  303?324.\par \par Kortenkamp, U.  (1997).\'a0\'a0Every simplicial polytope with at most d+4 vertices is a quotient of a neighborly polytope.  \ul Discrete & Computational Geometry. 18,\ul0  455?462.\par \par Kortenkamp, U., Richter-Gebert J., Sarangarajan A., & Ziegler G. M.  (1997).\'a0\'a0Extremal properties of 0/1-polytopes.  \ul Discrete & Computational Geometry. 17,\ul0  439?448.\par \par }