TY  - RPRT
TI  - Advanced propulsion - Cleaner and quieter.
AU  - Beheim, M. A.
AU  - Antl, R. J.
AU  - Povolny, J. H.
PY  - 1972
UR  - https://ntrs.nasa.gov/citations/19720054013
ID  - 19720054013
ER  -