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Ladel, S., & Kortenkamp U.  (2013).\'a0\'a0An activity-theoretic approach to multi-touch tools in early maths learning.  \ul The International Journal for Technology in Mathematics Education. 20,\ul0  \par \par Ladel, S., & Kortenkamp U.  (2011).\'a0\'a0An activity-theoretic approach to multi-touch tools in early maths learning.  \ul Proceedings of ATATEMLO 2011 in Paris. \ul0  \par \par Kortenkamp, U.  (2008).\'a0\'a0Algorithmen im Mathematikunterricht.  (Kortenkamp, U., Weigand H-G., & Weth T., Ed.).\ul Informatische Ideen im Mathematikunterricht. Bericht \'fcber die 23. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik. \ul0  77?86.\par \par Kortenkamp, U.  (2006).\'a0\'a0Algorithmische Geometrie im Unterricht.  \ul Der Mathematikunterricht. 52,\ul0  32-39.\par \par Brehm, E., & Kortenkamp U.  (2004).\'a0\'a0Advanced Teaching of Geometry with Interactive Tools.  (Nagaoka, R., Ishi H., & Hitzer E., Ed.).\ul Proceedings of RIMS-Workshop ITMga 2003. \ul0  \par \par }