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Ladel, S., & Kortenkamp, U..  (2014).  Development of a Flexible Understanding of Place Value. In . Malm\'f6, Schweden: A Mathematics Education Perspective on early Mathematics Learning between the Poles of Instruction and Construction (POEM). Abgerufen von http://www.mah.se/upload/FAKULTETER/LS/LS-seminarier/POEM/Ladel_Kortenkamp%20-%20Development%20of%20a%20flexible%20understanding%20of%20place%20value.pdf\par \par 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 }