TY  - RPRT
TI  - Noise reduction techniques for propellers and engines
AU  - Crigler, J. L.
AU  - Hubbard, H. H.
AU  - Maglieri, D. J.
PY  - 1969
UR  - https://ntrs.nasa.gov/citations/19690012374
ID  - 19690012374
ER  -