By Unruh James F.   in INTER-NOISE and NOISE-CON Congress and Conference Proceedings

ISSN:0736-2935|1989|3|233-236

Institute of Noise Control Engineering‎(1989)‎

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By Unruh James F.   in Noise Control Engineering Journal

ISSN:0736-2501|36|2|91-96

Institute of Noise Control Engineering‎(1991)‎

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By Unruh James F.   Fox Douglas J.   in Journal of the American Helicopter Society

ISSN:2161-6027|44|3|172-178

AHS International‎(1999)‎

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