Submitted on: 27 September 2019.
Revised on: 17 December 2019.
Accepted on: 03 February 2020.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 27 November 1999.
Revised on: 03 January 2000.
Accepted on: 06 February 2000.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
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http://reply.papertrans.cn/1/61/6035/6035-34.png
Submitted on: 15 October 2008.
Revised on: 11 January 2009.
Accepted on: 01 February 2009.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY
Submitted on: 27 January 2020.
Revised on: 26 April 2020.
Accepted on: 18 June 2020.
___________________COMMUNICATIONS OF THE ACM---ASSOC COMPUTING MACHINERY