Submitted on: 07 April 2004.
Revised on: 08 July 2004.
Accepted on: 29 August 2004.
___________________JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
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Submitted on: 02 December 2016.
Revised on: 11 February 2017.
Accepted on: 01 April 2017.
___________________JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
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