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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 El-Demerdash, M., & Kortenkamp U.  (In Press).\'a0\'a0The Development of an Instrument to Measure Geometric Creativity.  \ul \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\'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 Kistener, S., Burns B., Vollmeyer R., & Kortenkamp U.  (2013).\'a0\'a0An Explorative Study of Search of Model Space in Problem Solving.  \ul \ul0  \par \par Kistener, S., Burns B., Vollmeyer R., & Kortenkamp U.  (2013).\'a0\'a0An Explorative Study of Search of Model Space in Problem Solving.  \ul \ul0  \par \par Hoffkamp, A., Kortenkamp U., & Seidel S.  (2013).\'a0\'a0Handreichung zur Situation mathematischer Vorkurse an sachsen-anhaltischen Hochschulen und Vorschl\'e4ge zu deren didaktisch-methodischer Ausgestaltung.  \ul \ul0  \par \par Libbrecht, P., & Kortenkamp U.  (2013).\'a0\'a0The Role of Metadata in the Design of Educational Activities.  \ul Proceedings of CERME 8, Antalya. \ul0  \par \par Libbrecht, P., Kortenkamp U., Rebholz S., & M\'fcller W.  (2013).\'a0\'a0Tales of a Companion Teacher Analytics.  (Vatrapu, R., Ed.).\ul Proceedings of the 2nd International Workshop on Teaching Analytics (IWTA-2013). \ul0  \par \par Libbrecht, P., Kortenkamp U., & Mercat C.  (2009).\'a0\'a0I2Geo: a Web-Library of Interactive Geometry.  (Sojka, P., Ed.).\ul Proceedings of the 2nd Workshop Towards a Digital Mathematics Library (DML-2009). \ul0  \par \par Kortenkamp, U.  (2009).\'a0\'a0Lernbausteine Klammergebirge.  \ul \ul0  \par \par Kortenkamp, U.  (2009).\'a0\'a0Lernbausteine Zahlenmauern.  \ul \ul0  \par \par }