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

Kortenkamp, U., & Fest A.  (2008).  From CAS/DGS Integration to Algorithms in Educational Math Software.  Proceedings of ATCM 08.  

Kortenkamp, U.  (2001).  The future of mathematical software.  Proceedings of MTCM 2000.  

Kortenkamp, U.  (2000).  Foundations of Dynamic Geometry.  Journal für Mathematikdidaktik. 21, 161?162.

Kortenkamp, U.  (1999).  Foundations of Dynamic Geometry.