1. On unmanned aircraft systems issues, challenges and operational restrictions preventing integration into the National Airspace System
2. 2Federal Aviation Administration,“Integration of civil unmanned aircraft system (UAS) in the national airspace system (NAS) roadmap,” U.S. Department of Transportation, Technical Report, 2013, Available: http://www.faa.gov/about/initiatives/uas-roadmap-2013.pdf.
3. 3European RPASSteering Group, “Roadmap for the integration of civil rpas into the european aviation system,” European Comission, Technical Report, 2013, Available:http://ec.europa.eu/enterprise/sectors/aerospace/files/rpas-roadmap-en-pdf.
4. 4The MITRECorporation Center for Advanced Aviation System Developement, “Issues concerning integration of unmanned aerial vehicles in civil airspace,” Technical Report, 2014,Available:http://www.mitre.org/sites/default/files/pdf/04-1232.pdf.
5. Human Factors in Aviation