By Richards Roy L.   Freytag John C.   in Noise Control Engineering

ISSN:0093-9978|3|2|71-76

Institute of Noise Control Engineering‎(1974)‎

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By Richards Roy L.   Hauge Jan H.   in INTER-NOISE and NOISE-CON Congress and Conference Proceedings

ISSN:0736-2935|1984|2|737-740

Institute of Noise Control Engineering‎(1984)‎

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By Richards Roy L   Park Ioana   Brack Michael D   in INTER-NOISE and NOISE-CON Congress and Conference Proceedings

ISSN:0736-2935|1996|1|593-598

Institute of Noise Control Engineering‎(1996)‎

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