IEEE Transactions on Knowledge and Data Engineering, Volume 21

Volume 21, Number 1, January 2009

Volume 21, Number 2, February 2009

Volume 21, Number 3, March 2009

Volume 21, Number 4, April 2009

Volume 21, Number 5, May 2009

Volume 21, Number 6, June 2009

Volume 21, Number 7, July 2009

Volume 21, Number 8, August 2009

Volume 21, Number 9, September 2009

Volume 21, Number 10, October 2009

Volume 21, Number 11, November 2009

Volume 21, Number 12, December 2009