http://reply.papertrans.cn/3/253/25243/25243-31.png
Submitted on: 06 April 1999.
Revised on: 17 May 1999.
Accepted on: 30 May 1999.
NULL
Submitted on: 28 March 2009.
Revised on: 25 April 2009.
Accepted on: 02 May 2009.
NULL
http://reply.papertrans.cn/3/253/25243/25243-34.png
http://reply.papertrans.cn/3/253/25243/25243-35.png
Submitted on: 31 May 2011.
Revised on: 15 June 2011.
Accepted on: 23 June 2011.
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