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Submitted on: 13 October 2009.
Revised on: 01 February 2010.
Accepted on: 31 March 2010.
___________________Advances in Electrical and Electronic Engineering
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Submitted on: 09 September 2019.
Revised on: 30 December 2019.
Accepted on: 15 January 2020.
___________________Advances in Electrical and Electronic Engineering
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Submitted on: 16 June 1999.
Revised on: 20 August 1999.
Accepted on: 10 October 1999.
___________________Advances in Electrical and Electronic Engineering
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