Information Processing Letters, Volume 40

Volume 40, Number 1, 11 October 1991

Volume 40, Number 2, 25 October 1991

Volume 40, Number 3, 8 November 1991

Volume 40, Number 4, 25 November 1991

Volume 40, Number 5, 13 December 1991

Volume 40, Number 6, 30 December 1991