@misc{indiciae0a3202e42213,
  title = {Share the Sky: Concepts and Technologies That Will Shape Future Airspace Use},
  author = {Ballin, Mark G. and Cotton, William and Kopardekar, Parimal},
  year = {2011},
  url = {https://ntrs.nasa.gov/citations/20110015829},
  note = {Source identifier: 20110015829}
}