TY  - RPRT
TI  - Wake Geometry Effects on Rotor Blade-Vortex Interaction Noise Directivity
AU  - Martin, R. M.
AU  - Marcolini, Michael A.
AU  - Splettstoesser, W. R.
AU  - Schultz, K.-J.
PY  - 1990
UR  - https://ntrs.nasa.gov/citations/19910003002
ID  - 19910003002
ER  -