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Submitted on: 21 April 2012.
Revised on: 15 August 2012.
Accepted on: 09 September 2012.
___________________Journal of Semiconductor Technology and Science
Submitted on: 31 August 1998.
Revised on: 07 October 1998.
Accepted on: 15 November 1998.
___________________Journal of Semiconductor Technology and Science
Submitted on: 18 December 2009.
Revised on: 29 March 2010.
Accepted on: 26 May 2010.
___________________Journal of Semiconductor Technology and Science