Spannagel, C., & Kortenkamp U.  (2009).  Demonstrating, Guiding, and Analyzing Processes in Dynamic Geometry Systems.  (Bardini, C., Fortin C., Oldknow A., & Vagost D., Ed.).Proceedings of the 9th International Conference on Technology in Mathematics Teaching.  

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

Müller, W., Bescherer C., Kortenkamp U., & Spannagel C.  (2006).  Intelligent Computer-aided Assessment in the Math Classroom: State-of-the-art and Perspectives.  Proceedings of the IFIP WG 3.1, 3.3, & 3.5 Joint Conference Imagining the future for ICT and Education, Alesund, Norway.