@misc{indiciae0efd6002affe,
  title = {Vertical Takeoff and Landing (VTOL) propulsion technology},
  author = {Carl C. Ciepluch and John M. Abbott and Royce D. Moore and James F. Sellers},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800001979},
  note = {Source identifier: 19800001979}
}