Submitted on: 17 October 2014.
Revised on: 30 January 2015.
Accepted on: 19 February 2015.
___________________ELECTRONICS LETTERS---WILEY
Submitted on: 04 May 2009.
Revised on: 25 June 2009.
Accepted on: 09 July 2009.
___________________ELECTRONICS LETTERS---WILEY
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Submitted on: 13 March 2002.
Revised on: 12 April 2002.
Accepted on: 06 May 2002.
___________________ELECTRONICS LETTERS---WILEY
Submitted on: 07 May 1999.
Revised on: 02 August 1999.
Accepted on: 27 September 1999.
___________________ELECTRONICS LETTERS---WILEY
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