Submitted on: 16 September 2000.
Revised on: 16 November 2000.
Accepted on: 18 December 2000.
___________________Advances in Mathematics of Communications
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Submitted on: 12 October 2014.
Revised on: 21 December 2014.
Accepted on: 25 January 2015.
___________________Advances in Mathematics of Communications
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Submitted on: 06 August 2006.
Revised on: 26 August 2006.
Accepted on: 25 October 2006.
___________________Advances in Mathematics of Communications
Submitted on: 12 April 2014.
Revised on: 02 June 2014.
Accepted on: 23 June 2014.
___________________Advances in Mathematics of Communications
Submitted on: 18 October 2011.
Revised on: 22 November 2011.
Accepted on: 24 December 2011.
___________________Advances in Mathematics of Communications
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Submitted on: 15 January 2002.
Revised on: 06 February 2002.
Accepted on: 02 March 2002.
___________________Advances in Mathematics of Communications