Submitted on: 06 July 1999.
Revised on: 18 July 1999.
Accepted on: 03 August 1999.
Turkish Journal of Electrical Engineering and Computer Sciences
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Submitted on: 06 August 2012.
Revised on: 27 August 2012.
Accepted on: 19 September 2012.
Turkish Journal of Electrical Engineering and Computer Sciences
Submitted on: 13 April 2000.
Revised on: 11 May 2000.
Accepted on: 03 June 2000.
Turkish Journal of Electrical Engineering and Computer Sciences