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Ladel, S., Kortenkamp, U., & Etzold, H..  (2018).  Mathematik mit digitalen Medien ? konkret. Ein Handbuch f\'fcr Lehrpersonen der Primarstufe. 4. Band der Reihe Lernen, Lehren und Forschen mit digitalen Medien in der Primarstufe. M\'fcnster: WTM-Verlag.\par \par Ladel, S., & Kortenkamp, U..  (2016).  Artifact-Centric Activity Theory - A Framework for the Analysis of the Design and Use of Virtual Manipulatives. In P.  Moyer-Packenham (Hrsg.), International Perspectives on Teaching and Learning Mathematics with Virtual Manipulatives (S. 25-40). Heidelberg: Springer Verlag.\par \par 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..  (2014).  Flexible Use and Understanding of Place Value Via Traditional and Digital Tools. Research Report. In P.  Lilijedahl, Nicol, C., Oesterle, S., & Allan, D. (Hrsg.), Proceedings of the 38th Conference of the International Group for the Psychology of Mathematics Education and the 36th Conference of the North American Chapter of the Psychology of Mathematics Education. Vancouver, Canada: Psychology of Mathematics Education (PME).\par \par Ladel, S., & Kortenkamp, U..  (2014).  Handlungsorientiert zu einem flexiblen Verst\'e4ndnis von Stellenwerten - ein Ansatz aus Sicht der Artefact-Centric Activity Theory. In S.  Ladel & Schreiber, C. (Hrsg.), Von Audiopodcast bis Zahlensinn (Bd. 2, S. 151-177). M\'fcnster: WTM-Verlag.\par \par Ladel, S., & Kortenkamp, U..  (2014).  "Ist das dann noch ein Zehner oder ist das dann ein Einer?" - Zu einem flexiblen Verst\'e4ndnis von Stellenwerten. In J.  Roth & Armes, J. (Hrsg.), Beitr\'e4ge zum Mathematikunterricht 2014 - Beitr\'e4ge zur 48. Jahrestagung der Gesellschaft f\'fcr Didaktik der Mathematik vom 10. bis 14. M\'e4rz 2014 in Koblenz (S. 699-703). M\'fcnster: WTM-Verlag.\par \par Kortenkamp, U., & Ladel, S..  (2013).  An activity-approach to multi-touch tools in early maths learning. The International Journal for Technology in Mathematics Education, 20, 3-8.\par \par Ladel, S., & Kortenkamp, U..  (2013).  An activity-theoretic approach to multi-touch tools in early maths learning. The International Journal for Technoloy in Mathematics Education, 20, 3-8.\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 Kortenkamp, U., Brandt, B., Benz, C., Krummheuer, G., Ladel, S., & Vogel, R. (Hrsg.).  (2013).  Early Mathematics Learning. Selected Papers of the POEM 2012 Conference. New York: Springer.\par \par Ladel, S., & Kortenkamp, U..  (2013).  Number Concepts - Process of Internalization and Externalization by the Use of Multi-Touch Technology. In U.  Kortenkamp, Brandt, B., Benz, C., Krummheuer, G., Ladel, S., & Vogel, R. (Hrsg.), Early Mathematics Learning. Selected Papers of the POEM 2012 Conference. (S. 237-253). New York: Springer.\par \par Ladel, S., & Kortenkamp, U..  (2011).  Finger-symbol-sets and multi-touch for a better understanding of numbers and operations. In M.  Pytlak, Rowland, T., & Swoboda, E. (Hrsg.), Proceedings of the Seventh Congress of the European Society for Research in Mathematics Education.. gehalten auf der Februar, Rzesz\'f3w, Poland: Congress of the European Society for Research in Mathematics Education (CERME).\par \par Ladel, S., & Kortenkamp, U..  (2011).  Implementation of a multi-touch-environment supporting finger-symbol-sets. In M.  Pytlak, Rowland, T., & Swoboda, E. (Hrsg.), Proceedings of the Seventh Congress of the European Society for Research in Mathematics Education.. gehalten auf der Februar, Rzesz\'f3w, Poland: Congress of the European Society for Research in Mathematics Education (CERME).\par \par Ladel, S., & Kortenkamp, U..  (2009).  Realisation of MERs (Multiple Extern Representations) and MERLs (Multiple Equivalent Linked Representations) in Elementary Mathematics Software. In V.  Durand-Guerrier, Soury-Lavergne, S., & Arzarello, F. (Hrsg.), Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). gehalten auf der Januar, Februar, Lyon, France: Congress of the European Society for Research in Mathematics Education (CERME).\par \par Ladel, S., & Kortenkamp, U..  (2009).  Virtuell-enaktives Arbeiten mit der "Kraft der F\'fcnf". MNU Primar, 3, 91-95.\par \par }