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Submitted on: 14 April 2009.
Revised on: 04 August 2009.
Accepted on: 02 September 2009.
___________________Energy Efficiency---SPRINGER
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Submitted on: 12 October 1998.
Revised on: 15 January 1999.
Accepted on: 26 January 1999.
___________________Energy Efficiency---SPRINGER
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Submitted on: 15 June 2015.
Revised on: 20 September 2015.
Accepted on: 31 October 2015.
___________________Energy Efficiency---SPRINGER
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Submitted on: 05 May 2002.
Revised on: 16 June 2002.
Accepted on: 03 July 2002.
___________________Energy Efficiency---SPRINGER
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