Computers & Operations Research, Volume 18

Volume 18, Number 1, 1991

Volume 18, Number 2, 1991

Volume 18, Number 3, 1991

Volume 18, Number 4, 1991

Volume 18, Number 5, 1991

Volume 18, Number 6, 1991

Volume 18, Number 7, 1991

Volume 18, Number 8, 1991