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Submitted on: 04 July 1998.
Revised on: 07 September 1998.
Accepted on: 04 October 1998.
___________________Arabian Journal of Chemistry---ELSEVIER
Submitted on: 29 December 2011.
Revised on: 18 January 2012.
Accepted on: 14 February 2012.
___________________Arabian Journal of Chemistry---ELSEVIER
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Submitted on: 07 August 2008.
Revised on: 31 October 2008.
Accepted on: 08 December 2008.
___________________Arabian Journal of Chemistry---ELSEVIER
Submitted on: 25 January 2016.
Revised on: 15 March 2016.
Accepted on: 30 March 2016.
___________________Arabian Journal of Chemistry---ELSEVIER