Computers & Operations Research, Volume 39

Volume 39, Number 1, January 2012

Volume 39, Number 2, February 2012

Volume 39, Number 3, March 2012

Volume 39, Number 4, April 2012

Volume 39, Number 5, May 2012

Volume 39, Number 6, June 2012

Volume 39, Number 7, July 2012