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Ladel, S., & Kortenkamp U.  (Submitted).\'a0\'a0Number concepts ?- processes of internalization and externalization by the use of multi-touch technology Silke Ladel and Ulrich Kortenkamp.  \ul Early Mathematics Learning. \ul0  \par \par [Gast]  (2014).\'a0\'a0Early Mathematics Learning.  (Kortenkamp, U., Brandt B., Benz C., Krummheuer G., Ladel S., & Vogel R., Ed.).\ul \ul0  \par \par 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.  (2013).\'a0\'a0Designing a technology based learning environment for place value using artifact-centric activity theory.  (Lindmeier, A. M., & Heinze A., Ed.).\ul Proceedings of the 37th conference of the International Group for the Psychology of Mathematics Education. Mathematics learning across the life span. 1,\ul0  188-192.\par \par Ladel, S., & Kortenkamp U.  (2012).\'a0\'a0Early maths with multi-touch ? an activity-theoretic approach.  \ul Proceedings of POEM 2012. \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 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 Ladel, S., & Kortenkamp U.  (2011).\'a0\'a0Implementation of a multi-touch-environment supporting finger symbol sets.  \ul Proceedings of CERME 7, Rzeszow. \ul0  \par \par Ladel, S., & Kortenkamp U.  (2009).\'a0\'a0Realisations of MERS (Multiple Extern Representations) and MELRS (Multiple Equivalent Linked Representations) in Elementary Mathematics Software.  (Durand-Guerrier, V., Soury-Lavergne S., & Arzarello F., Ed.).\ul Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). \ul0  \par \par Ladel, S., & Kortenkamp U.  (2009).\'a0\'a0Virtuell-enaktives Arbeiten mit der ?Kraft der F\'fcnf''.  \ul MNUprimar. \ul0  \par \par }