Submitted on: 01 March 2016.
Revised on: 21 May 2016.
Accepted on: 23 June 2016.
___________________Journal of Taibah University for Science
Submitted on: 02 May 2011.
Revised on: 01 June 2011.
Accepted on: 24 June 2011.
___________________Journal of Taibah University for Science
Submitted on: 26 March 2001.
Revised on: 06 July 2001.
Accepted on: 06 August 2001.
___________________Journal of Taibah University for Science
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Submitted on: 13 January 2003.
Revised on: 30 April 2003.
Accepted on: 09 June 2003.
___________________Journal of Taibah University for Science
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Submitted on: 20 August 2008.
Revised on: 02 October 2008.
Accepted on: 22 October 2008.
___________________Journal of Taibah University for Science
Submitted on: 06 December 2012.
Revised on: 27 March 2013.
Accepted on: 27 April 2013.
___________________Journal of Taibah University for Science
Submitted on: 20 October 1999.
Revised on: 17 November 1999.
Accepted on: 06 January 2000.
___________________Journal of Taibah University for Science
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