Submitted on: 11 August 2008.
Revised on: 12 September 2008.
Accepted on: 09 November 2008.
___________________Clean Technologies---MDPI
Submitted on: 28 November 2014.
Revised on: 03 February 2015.
Accepted on: 25 February 2015.
___________________Clean Technologies---MDPI
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Submitted on: 10 June 2015.
Revised on: 07 October 2015.
Accepted on: 19 November 2015.
___________________Clean Technologies---MDPI
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Submitted on: 20 January 2022.
Revised on: 08 May 2022.
Accepted on: 17 June 2022.
___________________Clean Technologies---MDPI