By Ley Jason   Anton John   in INTER-NOISE and NOISE-CON Congress and Conference Proceedings

ISSN:0736-2935|250|2|4737-4744

Institute of Noise Control Engineering‎(2015)‎

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By Jenney David S.   Olson John H.   Landgrebe Anton John   in Journal of the American Helicopter Society

ISSN:2161-6027|13|2|1-26

AHS International‎(1968)‎

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