Submitted on: 14 December 2011.
Revised on: 04 April 2012.
Accepted on: 22 April 2012.
___________________HETEROATOM CHEMISTRY---WILEY-HINDAWI
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Submitted on: 13 November 1998.
Revised on: 13 December 1998.
Accepted on: 07 January 1999.
___________________HETEROATOM CHEMISTRY---WILEY-HINDAWI
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