Submitted on: 10 July 1998.
Revised on: 30 July 1998.
Accepted on: 19 August 1998.
NOISE CONTROL ENGINEERING JOURNAL
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http://reply.papertrans.cn/3/232/23185/23185-33.png
Submitted on: 13 August 1999.
Revised on: 26 August 1999.
Accepted on: 19 September 1999.
NOISE CONTROL ENGINEERING JOURNAL
http://reply.papertrans.cn/3/232/23185/23185-35.png
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