TY  - RPRT
TI  - JT9D-7A /SP/ jet engine performance deterioration trends
AU  - Richter, G. P.
AU  - Olsson, W. J.
AU  - Andersen, N. B.
PY  - 1980
UR  - https://ntrs.nasa.gov/citations/19800060060
ID  - 19800060060
ER  -