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Submitted on: 12 December 2012.
Revised on: 03 April 2013.
Accepted on: 23 May 2013.
___________________Journal of Chemistry---HINDAWI LTD
Submitted on: 15 February 2005.
Revised on: 05 June 2005.
Accepted on: 05 July 2005.
___________________Journal of Chemistry---HINDAWI LTD