Submitted on: 22 March 2012.
Revised on: 22 April 2012.
Accepted on: 10 May 2012.
___________________JOURNAL OF THE ACM---ASSOC COMPUTING MACHINERY
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Submitted on: 11 November 2015.
Revised on: 21 January 2016.
Accepted on: 06 March 2016.
___________________JOURNAL OF THE ACM---ASSOC COMPUTING MACHINERY
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Submitted on: 25 May 2018.
Revised on: 27 June 2018.
Accepted on: 18 July 2018.
___________________JOURNAL OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 19 December 2010.
Revised on: 08 February 2011.
Accepted on: 02 April 2011.
___________________JOURNAL OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 21 May 2007.
Revised on: 20 August 2007.
Accepted on: 27 September 2007.
___________________JOURNAL OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 13 December 2005.
Revised on: 27 March 2006.
Accepted on: 03 May 2006.
___________________JOURNAL OF THE ACM---ASSOC COMPUTING MACHINERY
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