1. Case. E. E., Zelnio. A. M. and Rigling. B. D., 2008. Low-Cost Acoustic Array for Small UAV Detection and Tracking, in Aerospace and Electronics Conference, Dayton.
2. European Comission, 2008. Regulation (EC) No 216/2008, Official Journal of the European Union, Brussels.
3. Federal Aviation Administration, 2017. FAA Aerospace Forecast - Fiscal Years 2017-2037, United States Department of Transportation, Washington.
4. FLIR, 2016. FLIR Lepton Engineering Datasheet, Version 1.2.6, March 17.
5. Gettinger, D., and Holland M. A., 2015. Drone Sightings and Close Encounters: An Analysis, Center for the Study of the Drone at Bard College, New York.