Submitted on: 11 July 2004.
Revised on: 21 September 2004.
Accepted on: 20 October 2004.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
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Submitted on: 16 May 2019.
Revised on: 12 July 2019.
Accepted on: 26 July 2019.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
Submitted on: 28 June 2017.
Revised on: 13 August 2017.
Accepted on: 02 September 2017.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
Submitted on: 15 October 2009.
Revised on: 11 November 2009.
Accepted on: 09 December 2009.
___________________Journal of Physical Science---UNIV SAINS MALAYSIA
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