Submitted on: 13 October 2002.
Revised on: 15 December 2002.
Accepted on: 07 February 2003.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 15 January 2005.
Revised on: 19 February 2005.
Accepted on: 06 March 2005.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 27 April 2008.
Revised on: 25 June 2008.
Accepted on: 24 July 2008.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
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Submitted on: 21 June 2002.
Revised on: 27 July 2002.
Accepted on: 07 August 2002.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 18 November 2016.
Revised on: 02 March 2017.
Accepted on: 19 March 2017.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 23 January 2019.
Revised on: 07 March 2019.
Accepted on: 18 April 2019.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 02 November 2013.
Revised on: 26 November 2013.
Accepted on: 13 December 2013.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 18 February 2016.
Revised on: 21 May 2016.
Accepted on: 07 July 2016.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY