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Submitted on: 11 May 2015.
Revised on: 30 August 2015.
Accepted on: 14 September 2015.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 30 September 2006.
Revised on: 17 December 2006.
Accepted on: 23 January 2007.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 07 March 2022.
Revised on: 03 April 2022.
Accepted on: 30 May 2022.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
http://reply.papertrans.cn/1/61/6036/6036-15.png
Submitted on: 03 December 2010.
Revised on: 01 January 2011.
Accepted on: 01 February 2011.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
http://reply.papertrans.cn/1/61/6036/6036-17.png
http://reply.papertrans.cn/1/61/6036/6036-18.png
Submitted on: 24 April 1999.
Revised on: 14 August 1999.
Accepted on: 03 September 1999.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 30 May 2023.
Revised on: 15 August 2023.
Accepted on: 27 September 2023.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY