Information Processing Letters, Volume 39

Volume 39, Number 1, 12 July 1991

Volume 39, Number 2, 31 July 1991

Volume 39, Number 3, 16 August 1991

Volume 39, Number 4, 30 August 1991

Volume 39, Number 5, 13 September 1991

Volume 39, Number 6, 27 September 1991