@misc{indiciaecc73bc9c3612,
  title = {Descent capability of two-propeller tilt-wing configurations},
  author = {James L. Hassell, Jr. and Robert H. Kirby},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660015321},
  note = {Source identifier: 19660015321}
}