Submitted on: 05 January 2017.
Revised on: 06 February 2017.
Accepted on: 05 March 2017.
NULL
http://reply.papertrans.cn/3/244/24320/24320-22.png
Submitted on: 08 June 2011.
Revised on: 19 July 2011.
Accepted on: 30 July 2011.
NULL
Submitted on: 18 November 2000.
Revised on: 15 December 2000.
Accepted on: 29 December 2000.
NULL
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Submitted on: 17 August 2000.
Revised on: 25 August 2000.
Accepted on: 30 August 2000.
NULL
Submitted on: 18 March 2005.
Revised on: 28 March 2005.
Accepted on: 07 April 2005.
NULL
Submitted on: 12 November 2002.
Revised on: 09 December 2002.
Accepted on: 17 December 2002.
NULL
http://reply.papertrans.cn/3/244/24320/24320-29.png
http://reply.papertrans.cn/3/244/24320/24320-30.png