• 2015polyhedral cycles paper delivered to the 10th annual conference of the dgfgg (german society of geometry and graphics) at the faculty for architecture in the institute for technology karlsruhe (kit)
  • 2010planar symmetriesdepartment of visual arts at the faculty of architecture, rwth aachen
  • 2009model of the 27 lines configurationpaper delivered at the 5th annual conference of the dgfgg at munich technical university on the theme of geometry and visualisation
  • 2009geomathikum aachen - dream or realitypaper delivered at the 5th annual conference of the dgfgg at munich technical university on the theme of geometry and visualisation
  • 2007 thirty years of constructive geometry at the university of fine arts hamburgfarewell lecture at the university of fine arts hamburg
  • 2005polyhedra in cubic sphere packingin conjunction with the geometric structures exhibition at kaiserslautern technical university
  • 2005building set of space-filling polyhedra paper delivered to the 1st annual conference of the dgfgg at the technical university hannover on the subject of positions in geometry education
  • 2005constructive geometry at the university of fine arts hamburg 1978 - 2005paper delivered to the 1st annual conference of the dgfgg at the technical university hannover on the subject of positions in geometry education