TY  - RPRT
TI  - Airworthiness criteria development for powered-lift aircraft: A program summary
AU  - Heffley, R. K.
AU  - Stapleford, R. L.
AU  - Rumold, R. C.
PY  - 1977
UR  - https://ntrs.nasa.gov/citations/19770016153
ID  - 19770016153
ER  -