Pattern Recognition Letters, Volume 12

Volume 12, Number 1, January 1991

Volume 12, Number 2, February 1991

Volume 12, Number 3, March 1991

Volume 12, Number 4, April 1991

Volume 12, Number 5, May 1991

Volume 12, Number 7, July 1991

Volume 12, Number 8, August 1991

Volume 12, NUmber 9, September 1991

Volume 12, Number 10, October 1991

Volume 12, Number 11, November 1991

Volume 12, Number 12, December 1991