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Book
[Gast] (2014).  Early Mathematics Learning. (Kortenkamp, U., Brandt B., Benz C., Krummheuer G., Ladel S., & Vogel R., Ed.).
Book Chapter
Kortenkamp, U. (2007).  Combining CAS and DGS – Towards Algorithmic Thinking. (Li, S., Wang D., & Zhang J-Z., Ed.).Symbolic Computation and Education. 150-173.
Ladel, S., & Kortenkamp U. (2013).  Designing a technology based learning environment for place value using artifact-centric activity theory. (Lindmeier, A. M., & Heinze A., Ed.).Proceedings of the 37th conference of the International Group for the Psychology of Mathematics Education. Mathematics learning across the life span. 1, 188-192.PDF icon LadelKortenkamp-DTBLE-RF4pme37-2013.pdf (81.92 KB)
Ladel, S., & Kortenkamp U. (2013).  Designing a technology based learning environment for place value using artifact-centric activity theory. (Lindmeier, A. M., & Heinze A., Ed.).Proceedings of the 37th conference of the International Group for the Psychology of Mathematics Education. Mathematics learning across the life span. 1, 188-192.PDF icon LadelKortenkamp-DTBLE-RF4pme37-2013.pdf (81.92 KB)
Bescherer, C., Herding D., Kortenkamp U., Müller W., & Zimmermann M. (2012).  E-learning Tools with Intelligent Assessment and Feedback. (Graf, S., Lin F., Kinshuk, & McGreal R., Ed.).Intelligent and Adaptive Learning Systems: Technology Enhanced Support for Learners and Teachers.
Ladel, S., & Kortenkamp U. (Submitted).  Number concepts –- processes of internalization and externalization by the use of multi-touch technology Silke Ladel and Ulrich Kortenkamp. Early Mathematics Learning.
Dohrmann, C., & Kuzle A. (2015).  Winkel in der Sekundarstufe I – Schülervorstellungen erforschen. (Filler, A., & Lambert A., Ed.).Geometrie zwischen Grundbegriffen und Grundvorstellungen. 29-42.
Conference Paper
Ladel, S., & Kortenkamp U. (2011).  An activity-theoretic approach to multi-touch tools in early maths learning. Proceedings of ATATEMLO 2011 in Paris. PDF icon LadelKortenkamp-AAMTEML-2011a.pdf (762.62 KB)
Trgalová, J., El-Demerdash M., Labs O., & Nicaud J-F. (2016).  Collaborative Design of Educational Digital Resources for Promoting Creative Mathematical Thinking. 13th International Congress on Mathematical Education. PDF icon TSG43_PA_trgalova_final.pdf (334.78 KB)
Ladel, S., & Kortenkamp U. (2012).  Early maths with multi-touch – an activity-theoretic approach. Proceedings of POEM 2012. PDF icon LadelKortenkamp-EMWMAA-2012a.pdf (1.91 MB)
Ladel, S., & Kortenkamp U. (2011).  Finger-Symbol-Sets and Multi-Touch for a better understanding of numbers and operations. Proceedings of CERME 7, Rzeszow. PDF icon LadelKortenkamp-FMBUNO-2011a.pdf (598.13 KB)
Abánades, M., Botana F., Escribano J., Hendriks M., Kortenkamp U., Kreis Y., et al. (2009).  The Intergeo File Format in Progress. Proceedings of the 22nd OpenMath Meeting. PDF icon AbánadesBotana-IFFP-2009a..pdf (181.7 KB)
Abánades, M., Botana F., Escribano J., Hendriks M., Kortenkamp U., Kreis Y., et al. (2009).  The Intergeo File Format in Progress. Proceedings of the 22nd OpenMath Meeting.
Libbrecht, P., Kortenkamp U., & Mercat C. (2009).  I2Geo: a Web-Library of Interactive Geometry. (Sojka, P., Ed.).Proceedings of the 2nd Workshop Towards a Digital Mathematics Library (DML-2009). PDF icon LibbrechtKortenkamp-IWIG-2009a.pdf (1.29 MB)
Ladel, S., & Kortenkamp U. (2011).  Implementation of a multi-touch-environment supporting finger symbol sets. Proceedings of CERME 7, Rzeszow. PDF icon LadelKortenkamp-IMSFSS-2011b.pdf (274.33 KB)
Kortenkamp, U., Blessing A. M., Dohrmann C., Kreis Y., Libbrecht P., & Mercat C. (2009).  Interoperable Interactive Geometry For Europe – First Technological and Educational Results and Future Challenges of the Intergeo Project. Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France).
Kortenkamp, U., Blessing A. M., Dohrmann C., Kreis Y., Libbrecht P., & Mercat C. (2009).  Interoperable Interactive Geometry For Europe – First Technological and Educational Results and Future Challenges of the Intergeo Project. Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). PDF icon KortenkampBlessing-IIGEFTERFCIP-2009b.pdf (188.07 KB)
Kortenkamp, U., & Materlik D. (2004).  Pen-based input of geometric constructions. (Libbrecht, P., Ed.).Proceedings of MathUI 2004. PDF icon KortenkampMaterlik-PIGC-2004a.pdf (154.41 KB)
Spannagel, C., & Kortenkamp U. (2007).  Prozesse beim Lernen mit DGS: Aufzeichnung, Wiedergabe, Analyse. (Ludwig, M., Ed.).Tagungsband des Arbeitskreis Geometrie der GDM. PDF icon SpannagelKortenkamp-PBLAWA-2007a.pdf (348.34 KB)
Ladel, S., & Kortenkamp U. (2009).  Realisations of MERS (Multiple Extern Representations) and MELRS (Multiple Equivalent Linked Representations) in Elementary Mathematics Software. (Durand-Guerrier, V., Soury-Lavergne S., & Arzarello F., Ed.).Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). PDF icon LadelKortenkamp-RMMERMMELREMS-2009a.pdf (355.73 KB)
Libbrecht, P., & Kortenkamp U. (2013).  The Role of Metadata in the Design of Educational Activities. Proceedings of CERME 8, Antalya. PDF icon LibbrechtKortenkamp-RMDEA-2013a.pdf (590.38 KB)
Libbrecht, P., Kortenkamp U., Rebholz S., & Müller W. (2013).  Tales of a Companion Teacher Analytics. (Vatrapu, R., Ed.).Proceedings of the 2nd International Workshop on Teaching Analytics (IWTA-2013). PDF icon LibbrechtKortenkamp-TCTA-2013a.pdf (804.96 KB)
Fest, A., & Kortenkamp U. (2007).  Teaching Graph Algorithms with Visage. (Sárvári, C., & Lavicza Z., Ed.).Proceedings of CADGME 2007 in Pécs.
Kuzle, A., & Dohrmann C. (2014).  Unpacking Children's Angle "Grundvorstellungen”: The Case of Distance “Grundvorstellung” of 1° Angle. (Liljedahl, P., & Sinclare N., Ed.).PME 38. PDF icon RR_Kuzle-Dohrmann-submitted.pdf (683.57 KB)
Kortenkamp, U., & Richter-Gebert J. (2004).  Using Automatic Theorem Proving to Improve the Usability of Geometry Software. (Libbrecht, P., Ed.).Proceedings of MathUI 2004. PDF icon KortenkampRichter-Ge-UATPIUGS-2004a.pdf (842.28 KB)

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