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Submitted on: 14 November 2012.
Revised on: 17 January 2013.
Accepted on: 19 February 2013.
___________________IET Circuits Devices & Systems
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Submitted on: 05 November 1998.
Revised on: 02 March 1999.
Accepted on: 03 April 1999.
___________________IET Circuits Devices & Systems
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Submitted on: 02 November 1998.
Revised on: 22 November 1998.
Accepted on: 12 January 1999.
___________________IET Circuits Devices & Systems
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