TY  - RPRT
TI  - Perpendicular blade vortex interaction and its implications for helicopter noise prediction: Wave-number frequency spectra in a trailing vortex for BWI noise prediction
AU  - Devenport, William J.
AU  - Glegg, Stewart A. L.
PY  - 1993
UR  - https://ntrs.nasa.gov/citations/19940006297
ID  - 19940006297
ER  -