Submitted on: 10 July 2001.
Revised on: 31 October 2001.
Accepted on: 06 December 2001.
___________________Asia-Pacific Journal of Chemical Engineering
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Submitted on: 25 October 1998.
Revised on: 03 December 1998.
Accepted on: 22 December 1998.
___________________Asia-Pacific Journal of Chemical Engineering
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Submitted on: 22 April 2012.
Revised on: 05 August 2012.
Accepted on: 04 September 2012.
___________________Asia-Pacific Journal of Chemical Engineering
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