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Submitted on: 06 May 2013.
Revised on: 21 July 2013.
Accepted on: 09 August 2013.
___________________IEEE Industrial Electronics Magazine
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Submitted on: 23 May 2009.
Revised on: 09 September 2009.
Accepted on: 23 September 2009.
___________________IEEE Industrial Electronics Magazine
Submitted on: 17 February 1998.
Revised on: 29 March 1998.
Accepted on: 13 April 1998.
___________________IEEE Industrial Electronics Magazine
Submitted on: 29 October 2014.
Revised on: 15 December 2014.
Accepted on: 31 December 2014.
___________________IEEE Industrial Electronics Magazine
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