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Submitted on: 24 January 2002.
Revised on: 05 April 2002.
Accepted on: 18 May 2002.
___________________International Journal of Acoustics and Vibration
Submitted on: 01 September 2012.
Revised on: 26 October 2012.
Accepted on: 15 December 2012.
___________________International Journal of Acoustics and Vibration