Submitted on: 13 May 2019.
Revised on: 02 August 2019.
Accepted on: 26 August 2019.
___________________APPLIED ACOUSTICS---ELSEVIER SCI LTD
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Submitted on: 31 October 1998.
Revised on: 11 December 1998.
Accepted on: 25 December 1998.
___________________APPLIED ACOUSTICS---ELSEVIER SCI LTD
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