Submitted on: 16 July 2008.
Revised on: 10 September 2008.
Accepted on: 28 October 2008.
___________________Elektrotechnik und Informationstechnik
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Submitted on: 16 February 2009.
Revised on: 19 April 2009.
Accepted on: 19 May 2009.
___________________Elektrotechnik und Informationstechnik
Submitted on: 20 February 2012.
Revised on: 04 May 2012.
Accepted on: 11 June 2012.
___________________Elektrotechnik und Informationstechnik
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Submitted on: 03 December 2003.
Revised on: 29 March 2004.
Accepted on: 12 May 2004.
___________________Elektrotechnik und Informationstechnik
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