http://reply.papertrans.cn/1/61/6034/6034-21.png
Submitted on: 11 June 2006.
Revised on: 05 October 2006.
Accepted on: 16 October 2006.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
http://reply.papertrans.cn/1/61/6034/6034-23.png
Submitted on: 06 July 2011.
Revised on: 17 September 2011.
Accepted on: 26 October 2011.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
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Submitted on: 09 January 2016.
Revised on: 29 March 2016.
Accepted on: 28 April 2016.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 08 August 2004.
Revised on: 28 August 2004.
Accepted on: 05 October 2004.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 21 June 2003.
Revised on: 18 October 2003.
Accepted on: 16 November 2003.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 06 September 2001.
Revised on: 09 December 2001.
Accepted on: 29 December 2001.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 28 May 2010.
Revised on: 04 September 2010.
Accepted on: 06 October 2010.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY