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.  

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.  

Dohrmann, C., & Kuzle A.  (2015).  Winkel in der Sekundarstufe I ? Schülervorstellungen erforschen.  (Filler, A., & Lambert A., Ed.).Geometrie zwischen Grundbegriffen und Grundvorstellungen.  29-42.

[Gast]  (2014).  Early Mathematics Learning.  (Kortenkamp, U., Brandt B., Benz C., Krummheuer G., Ladel S., & Vogel R., Ed.). 

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.  

Ladel, S., & Kortenkamp U.  (2013).  An activity-theoretic approach to multi-touch tools in early maths learning.  The International Journal for Technology in Mathematics Education. 20, 

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.

Libbrecht, P., & Kortenkamp U.  (2013).  The Role of Metadata in the Design of Educational Activities.  Proceedings of CERME 8, Antalya.  

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).  

Ladel, S., & Kortenkamp U.  (2012).  Early maths with multi-touch ? an activity-theoretic approach.  Proceedings of POEM 2012.  

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.  

Kuzle, A.  (2012).  Preservice teachers? patterns of metacognitive behavior during mathematics problem solving in a dynamic geometry environment.  (Ludwig, M., & Kleine M., Ed.).46. Jahrestagung der Gesellschaft für Didaktik der Mathematik. 2, 513?516.

Ladel, S., & Kortenkamp U.  (2011).  An activity-theoretic approach to multi-touch tools in early maths learning.  Proceedings of ATATEMLO 2011 in Paris.  

[Gast]  (2011).  Computerwerkzeuge und Prüfungen / Aufgaben mit Technologieeinsatz im Mathematikunterricht. Bericht über die 24. und 25. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik.  (Kortenkamp, U., Lambert A., & Zeimetz A., Ed.). 

Ladel, S., & Kortenkamp U.  (2011).  Finger-Symbol-Sets and Multi-Touch for a better understanding of numbers and operations.  Proceedings of CERME 7, Rzeszow.  

Trgalova, J., Kortenkamp U., Jahn A P., Libbrecht P., Mercat C., Recio T., et al.  (2011).  I2Geo.net ? a platform for sharing dynamic geometry resources all over Europe.   

Ladel, S., & Kortenkamp U.  (2011).  Implementation of a multi-touch-environment supporting finger symbol sets.  Proceedings of CERME 7, Rzeszow.  

Kortenkamp, U., & Laborde C.  (2011).  Interoperable Interactive Geometry for Europe: an introduction.  ZDM ? The International Journal on Mathematics Education.  1-3.

Libbrecht, P., Kortenkamp U., & Mercat C.  (2010).  Crossing Cultural Boundaries with Long Term Interactive Geometry Resources.   

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.  

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).  

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).  

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).  

Ladel, S., & Kortenkamp U.  (2009).  Virtuell-enaktives Arbeiten mit der ?Kraft der Fünf''.  MNUprimar.  

Kortenkamp, U.  (2008).  Math Unit Testing ? A New Approach to the Use of Technology in Teaching.  (Laborde, C., Ed.). 

Kortenkamp, U.  (2007).  Combining CAS and DGS ? Towards Algorithmic Thinking.  (Li, S., Wang D., & Zhang J-Z., Ed.).Symbolic Computation and Education.  150-173.

Spannagel, C., & Kortenkamp U.  (2007).  Prozesse beim Lernen mit DGS: Aufzeichnung, Wiedergabe, Analyse.  (Ludwig, M., Ed.).Tagungsband des Arbeitskreis Geometrie der GDM.  

Fest, A., & Kortenkamp U.  (2007).  Teaching Graph Algorithms with Visage.  (Sárvári, C., & Lavicza Z., Ed.).Proceedings of CADGME 2007 in Pécs.  

Geschke, A., Kortenkamp U., Lutz-Westphal B., & Materlik D.  (2005).  Visage ? Visualization of Algorithms in Discrete Mathematics.  Zentralblatt für Didaktik der Mathematik. 37, 395-401.

Kortenkamp, U., & Materlik D.  (2004).  Pen-based input of geometric constructions.  (Libbrecht, P., Ed.).Proceedings of MathUI 2004.  

Kortenkamp, U., & Richter-Gebert J.  (2004).  Using Automatic Theorem Proving to Improve the Usability of Geometry Software.  (Libbrecht, P., Ed.).Proceedings of MathUI 2004.  

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