TY  - RPRT
TI  - A study of blade-vortex interaction sound generation and directionality
AU  - Ringler, Todd D.
AU  - George, Albert R.
AU  - Steele, James B.
PY  - 1991
UR  - https://ntrs.nasa.gov/citations/19930045405
ID  - 19930045405
ER  -