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Submitted on: 29 September 2015.
Revised on: 21 October 2015.
Accepted on: 09 December 2015.
___________________APPLIED ACOUSTICS---ELSEVIER SCI LTD
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Submitted on: 11 May 2013.
Revised on: 01 September 2013.
Accepted on: 23 October 2013.
___________________APPLIED ACOUSTICS---ELSEVIER SCI LTD