1. UAV-enabled intelligent transportation systems for the smart city: applications and challenges;Menouar;IEEE Communications Magazine,2017
2. Unmanned aerial vehicles applications in future smart cities;Mohamed;Technol Forecast Soc Change,2018
3. Unmanned aircraft system traffic management (UTM) concept of operations;Kopardekar,2016
4. Flight Demonstration of Unmanned Aircraft System (UAS) Traffic Management (UTM) at Technical Capability Level 4,";Rios,2020
5. SESAR. "U-space blueprint." https://www.sesarju.eu/sites/default/files/documents/reports/U-space%20Blueprint%20brochure%20final.PDF (accessed 2017-10-31.