Christian Dohrmann

INTEROPERABLE INTERACTIVE GEOMETRY FOR EUROPE - FIRST TECHNOLOGICAL AND EDUCATIONAL RESULTS AND FUTURE CHALLENGES OF THE INTERGEO PROJECT

Ulrich Kortenkamp, Paul Libbrecht, Yves Kreis, 2009 .

USER INTERFACE DESIGN FOR DYNAMIC GEOMETRY SOFTWARE

Ulrich Kortenkamp, Christian Dohrmann, 2010 .

Using the Intergeo Platform for Teaching and Research

Ulrich Kortenkamp, Paul Libbrecht, Yves Kreis, 2009 .

A method for positioning an object on a touch-sensitive screen

Ulrich Kortenkamp, Christian Dohrmann, Heiko Etzold, 2015 .