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2. Drone sightings and close encounters: An analysis;Gettinger;Center for the Study of the Drone, Bard College, Annandale-on-Hudson, NY, USA,2015
3. U.S. Department of Transportation, Federal Aviation Administration, 800 Independence Avenue, SW Washington, DC 20591, “Reported UAS Sightings (August 2015-January 2016) (MS Excel).” https://www.faa.gov/uas/media/UAS_Sightings_report_21Aug-31Jan.xlsx (2016).
4. U.S. Department of Transportation, Federal Aviation Administration, 800 Independence Avenue, SW Washington, DC 20591, “Reported UAS Sightings (November 2014-August 2015) (MS Excel).” https://www.faa.gov/uas/media/UASEventsNov2014-Aug2015.xls (2015).
5. Towards Autonomous Micro UAV Swarms