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Submitted on: 01 December 2009.
Revised on: 12 March 2010.
Accepted on: 09 April 2010.
___________________AIMS Materials Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 23 July 2004.
Revised on: 29 September 2004.
Accepted on: 15 October 2004.
___________________AIMS Materials Science---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 12 November 1998.
Revised on: 10 February 1999.
Accepted on: 07 April 1999.
___________________AIMS Materials Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 26 March 2000.
Revised on: 25 May 2000.
Accepted on: 19 July 2000.
___________________AIMS Materials Science---AMER INST MATHEMATICAL SCIENCES-AIMS