Operations Research Proceedings 1994 Selected Papers of the International Conference on Operations Research, Berlin, August 30 – September 2, 1994 Derigs Ulrich Heftet / 1995 / Engelsk
Operations Research ’93 Extended Abstracts of the 18th Symposium on Operations Research held at the University of Cologne September 1–3, 1993 Bachem Achim Heftet / 1994 / Engelsk
Operations Research Proceedings 1996 Selected Papers of the Symposium on Operations Research (SOR 96), Braunschweig, September 3 - 6, 1996 Zimmermann, Uwe Heftet / 1997 / Engelsk
