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Submitted on: 13 May 2000.
Revised on: 23 June 2000.
Accepted on: 17 July 2000.
___________________International Journal of Analytical Chemistry
Submitted on: 29 March 2009.
Revised on: 16 June 2009.
Accepted on: 30 July 2009.
___________________International Journal of Analytical Chemistry
Submitted on: 20 January 2004.
Revised on: 08 May 2004.
Accepted on: 09 June 2004.
___________________International Journal of Analytical Chemistry
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