Operations Research, Volume 39

Volume 39, Number 1, January / February 1991

Volume 39, Number 2, March / April 1991

Volume 39, Number 3, May / June 1991

Volume 39, Number 4, July / August 1991

Volume 39, Number 5, September / October 1991

Volume 39, Number 6, November / December 1991

maintained by Schloss Dagstuhl LZI at University of Trier