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Submitted on: 02 September 2009.
Revised on: 25 September 2009.
Accepted on: 23 October 2009.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
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Submitted on: 18 August 2024.
Revised on: 15 November 2024.
Accepted on: 09 January 2025.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
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Submitted on: 18 July 2012.
Revised on: 03 September 2012.
Accepted on: 31 October 2012.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
Submitted on: 23 March 2013.
Revised on: 27 April 2013.
Accepted on: 22 June 2013.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
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Submitted on: 19 February 2012.
Revised on: 17 April 2012.
Accepted on: 03 May 2012.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
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