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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 }