@misc{indiciae4a512f33766a,
  title = {Airworthiness criteria development for powered-lift aircraft: A program summary},
  author = {Heffley, R. K. and Stapleford, R. L. and Rumold, R. C.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770016153},
  note = {Source identifier: 19770016153}
}