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Submitted on: 26 December 2008.
Revised on: 11 February 2009.
Accepted on: 10 March 2009.
___________________JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
Submitted on: 16 July 2003.
Revised on: 09 August 2003.
Accepted on: 03 September 2003.
___________________JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
Submitted on: 09 February 2007.
Revised on: 21 May 2007.
Accepted on: 06 July 2007.
___________________JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
Submitted on: 29 September 1999.
Revised on: 05 January 2000.
Accepted on: 18 January 2000.
___________________JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
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