@misc{indiciaef00035d43520,
  title = {VTOL Urban Air Mobility Concept Vehicles for Technology Development},
  author = {Silva, Christopher and Johnson, Wayne and Antcliff, Kevin R. and Patterson, Michael D.},
  year = {2018},
  url = {https://ntrs.nasa.gov/citations/20180006683},
  note = {Source identifier: 20180006683}
}