Submitted on: 12 May 1999.
Revised on: 08 August 1999.
Accepted on: 01 October 1999.
___________________Energy Efficiency---SPRINGER
Submitted on: 27 July 1999.
Revised on: 20 October 1999.
Accepted on: 01 November 1999.
___________________Energy Efficiency---SPRINGER
Submitted on: 03 May 2001.
Revised on: 17 June 2001.
Accepted on: 16 July 2001.
___________________Energy Efficiency---SPRINGER
Submitted on: 10 August 2014.
Revised on: 03 November 2014.
Accepted on: 11 December 2014.
___________________Energy Efficiency---SPRINGER
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Submitted on: 02 June 2012.
Revised on: 26 August 2012.
Accepted on: 08 September 2012.
___________________Energy Efficiency---SPRINGER
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