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Submitted on: 07 April 1999.
Revised on: 13 May 1999.
Accepted on: 22 June 1999.
___________________Journal of Information and Telecommunication
Submitted on: 26 August 2000.
Revised on: 15 December 2000.
Accepted on: 02 January 2001.
___________________Journal of Information and Telecommunication
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Submitted on: 30 September 2016.
Revised on: 19 November 2016.
Accepted on: 06 December 2016.
___________________Journal of Information and Telecommunication
Submitted on: 18 April 2002.
Revised on: 11 May 2002.
Accepted on: 30 May 2002.
___________________Journal of Information and Telecommunication
Submitted on: 30 August 2010.
Revised on: 28 September 2010.
Accepted on: 08 October 2010.
___________________Journal of Information and Telecommunication