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Submitted on: 03 September 2011.
Revised on: 01 December 2011.
Accepted on: 24 December 2011.
___________________JASA Express Letters---AIP PUBLISHING
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Submitted on: 10 October 2020.
Revised on: 23 December 2020.
Accepted on: 03 February 2021.
___________________JASA Express Letters---AIP PUBLISHING
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