By Klein A.   Lutz Th.   Krämer E.   Richter K.   Gardner A.D.   Altmikus A.R.M.   in Journal of the American Helicopter Society

ISSN:2161-6027|57|4|1-13

AHS International‎(2012)‎

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By Kamruzzaman M.   Herrig A.   Lutz Th.   Würz W.   Krämer E.   Wagner S.   in Noise Control Engineering Journal

ISSN:0736-2501|59|1|54-67

Institute of Noise Control Engineering‎(2011)‎

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