http://reply.papertrans.cn/2/103/10244/10244-11.png
Submitted on: 06 November 2003.
Revised on: 19 December 2003.
Accepted on: 21 January 2004.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS
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Submitted on: 21 July 2009.
Revised on: 05 September 2009.
Accepted on: 17 October 2009.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS
Submitted on: 15 June 2024.
Revised on: 07 July 2024.
Accepted on: 21 July 2024.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS
Submitted on: 07 March 2017.
Revised on: 15 April 2017.
Accepted on: 04 May 2017.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS
Submitted on: 09 March 1999.
Revised on: 30 March 1999.
Accepted on: 18 April 1999.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS
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Submitted on: 03 October 2002.
Revised on: 25 January 2003.
Accepted on: 23 March 2003.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS
Submitted on: 26 August 2009.
Revised on: 23 September 2009.
Accepted on: 17 October 2009.
___________________Frontiers of Computer Science---HIGHER EDUCATION PRESS