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http://reply.papertrans.cn/3/291/29072/29072-23.png
Submitted on: 23 March 2007.
Revised on: 07 April 2007.
Accepted on: 01 May 2007.
NULL
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Submitted on: 11 April 2010.
Revised on: 22 May 2010.
Accepted on: 16 June 2010.
Sustainable Futures---ELSEVIER
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Submitted on: 28 January 2012.
Revised on: 12 February 2012.
Accepted on: 08 March 2012.
NULL