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Submitted on: 24 January 1999.
Revised on: 18 May 1999.
Accepted on: 17 July 1999.
___________________Applied Chemistry for Engineering
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Submitted on: 22 September 2016.
Revised on: 22 November 2016.
Accepted on: 04 January 2017.
___________________Applied Chemistry for Engineering
Submitted on: 08 December 2010.
Revised on: 18 March 2011.
Accepted on: 28 March 2011.
___________________Applied Chemistry for Engineering