Operations Research ’91 Extended Abstracts of the 16th Symposium on Operations Research held at the University of Trier at September 9–11, 1991 Gritzmann Peter Heftet / 1992 / Engelsk
Recent Advances in Optimization Proceedings of the 8th French-German Conference on Optimization Trier, July 21–26, 1996 Gritzmann Peter Heftet / 1997 / Engelsk
