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Submitted on: 03 December 2011.
Revised on: 07 February 2012.
Accepted on: 19 February 2012.
___________________Clean Technologies---MDPI
Submitted on: 18 October 2003.
Revised on: 24 November 2003.
Accepted on: 02 January 2004.
___________________Clean Technologies---MDPI
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Submitted on: 03 June 2015.
Revised on: 06 September 2015.
Accepted on: 21 September 2015.
___________________Clean Technologies---MDPI
Submitted on: 01 August 2004.
Revised on: 17 September 2004.
Accepted on: 12 October 2004.
___________________Clean Technologies---MDPI
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Submitted on: 28 August 2011.
Revised on: 07 November 2011.
Accepted on: 23 December 2011.
___________________Clean Technologies---MDPI
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