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Submitted on: 21 July 2018.
Revised on: 24 September 2018.
Accepted on: 10 November 2018.
___________________Cleaner Environmental Systems---ELSEVIER
Submitted on: 05 March 2003.
Revised on: 01 April 2003.
Accepted on: 02 May 2003.
___________________Cleaner Environmental Systems---ELSEVIER
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Submitted on: 18 December 1998.
Revised on: 24 February 1999.
Accepted on: 12 March 1999.
___________________Cleaner Environmental Systems---ELSEVIER
Submitted on: 25 May 2011.
Revised on: 05 August 2011.
Accepted on: 12 September 2011.
___________________Cleaner Environmental Systems---ELSEVIER
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Submitted on: 22 July 1999.
Revised on: 14 August 1999.
Accepted on: 26 September 1999.
___________________Cleaner Environmental Systems---ELSEVIER
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