Submitted on: 25 April 2012.
Revised on: 13 July 2012.
Accepted on: 09 September 2012.
___________________Energy Efficiency---SPRINGER
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Submitted on: 05 May 2012.
Revised on: 28 June 2012.
Accepted on: 08 July 2012.
___________________Energy Efficiency---SPRINGER
Submitted on: 18 May 2007.
Revised on: 14 July 2007.
Accepted on: 10 August 2007.
___________________Energy Efficiency---SPRINGER
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Submitted on: 26 October 2012.
Revised on: 05 December 2012.
Accepted on: 02 February 2013.
___________________Energy Efficiency---SPRINGER
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