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Submitted on: 19 September 2007.
Revised on: 15 October 2007.
Accepted on: 28 October 2007.
___________________Archives of Electrical Engineering
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Submitted on: 07 February 1999.
Revised on: 08 April 1999.
Accepted on: 23 May 1999.
___________________Archives of Electrical Engineering
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Submitted on: 07 November 2006.
Revised on: 23 December 2006.
Accepted on: 12 January 2007.
___________________Archives of Electrical Engineering
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