1. FAA, FAA Forecasts Fiscal Years 2018–2038, (2018)
2. Patterson, M., Antcliff, K., Kohlman, L.: A Proposed Approach to Studying Urban Air Mobility Missions Including an Initial Exploration of Mission Requirements, Proceedings of the 74th AHD International 74th Annual Forum, Phoenix, AZ, (2018)
3. Gettinger, D., Michel, A. H.: Drone Sightings and Close Encounters: An Analysis, Technical report, Center for the Study of the Drone, Bard College, Annandale-on-Hudson, New York, (2015)
4. Klyde, D., Mitchell, D., Alexandrov, N.: Development of a Process to Define Unmanned Aircraft Systems Handling Qualities, AIAA Atmospheric Flight Mechanics Conference, Kissimmee, FL, (2018)
5. Maskel, R., D.A.S.H.: Goes to War, Air & Space Smithsonian, https://www.airspacemag.com/military-aviation/dash-goes-to-war-23369442/, (2012)