Submitted on: 22 June 2001.
Revised on: 17 July 2001.
Accepted on: 01 August 2001.
Proceedings of the VLDB Endowment
Submitted on: 23 September 2010.
Revised on: 31 October 2010.
Accepted on: 09 November 2010.
Proceedings of the VLDB Endowment
Submitted on: 24 March 2003.
Revised on: 11 April 2003.
Accepted on: 01 May 2003.
Proceedings of the VLDB Endowment
Submitted on: 03 August 2000.
Revised on: 04 September 2000.
Accepted on: 21 September 2000.
Proceedings of the VLDB Endowment
Submitted on: 28 June 2002.
Revised on: 06 August 2002.
Accepted on: 20 August 2002.
Proceedings of the VLDB Endowment
Submitted on: 14 May 2008.
Revised on: 15 June 2008.
Accepted on: 23 June 2008.
Proceedings of the VLDB Endowment