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Submitted on: 30 November 2002.
Revised on: 21 January 2003.
Accepted on: 19 March 2003.
___________________APPLIED CLAY SCIENCE---ELSEVIER
Submitted on: 18 January 2008.
Revised on: 21 February 2008.
Accepted on: 26 March 2008.
___________________APPLIED CLAY SCIENCE---ELSEVIER
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http://reply.papertrans.cn/1/22/2165/2165-35.png
Submitted on: 20 August 2005.
Revised on: 16 September 2005.
Accepted on: 26 September 2005.
___________________APPLIED CLAY SCIENCE---ELSEVIER