European Workshop on Planning EWSP'91, Sankt Augustin, FRG, March 18-19, 1991. Proceedings Hertzberg Joachim Heftet / 1991 / Engelsk
Towards Affordance-Based Robot Control International Seminar, Dagstuhl Castle, Germany, June 5-9, 2006, Revised Papers Rome Erich Heftet / 2008 / Engelsk
KI 2007: Advances in Artificial Intelligence 30th Annual German Conference on AI, KI 2007, Osnabrück, Germany, September 10-13, 2007, Proceedings Hertzberg Joachim Heftet / 2007 / Engelsk
Perspective of Constraint-Based Reasoning An Introductory Tutorial Guesgen Hans W. Heftet / 1992 / Engelsk
