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Kortenkamp, U., & Ladel, S..  (2013).  Designing a technology based learning environment for place value using artefact-centric Activity Theory. Research Forum Activity Theoretical approaches to mathematics classroom practices with the use of technology. In A. M.  Lindmeier & Heinze, A. (Hrsg.), Proceedings of the 37th Conference of the International Group for the Psychology of Mathematics Education. Kiel, Germany: Psychology of Mathematics Education (PME).\par \par }