By Friedmann P. P.   Straub F.   in Journal of the American Helicopter Society

ISSN:2161-6027|25|1|36-44

AHS International‎(1980)‎

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By Friedmann P. P.   Shanthakumaran P.   in Journal of the American Helicopter Society

ISSN:2161-6027|29|4|70-80

AHS International‎(1984)‎

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By Friedmann P. P.   Kottapalli S. B. R.   in Journal of the American Helicopter Society

ISSN:2161-6027|27|4|28-36

AHS International‎(1982)‎

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By Chandrasekar J.   Liu L.   Friedmann P.P.   Bernstein D.S.   in INTER-NOISE and NOISE-CON Congress and Conference Proceedings

ISSN:0736-2935|2004|9|893-904

Institute of Noise Control Engineering‎(2004)‎

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By Lust S.D.   Friedmann P.P.   Bendiksen O.O.   in Journal of Sound and Vibration

ISSN:0022-460X|180|2|313-332

Academic Press‎(1995)‎

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