1. Federal Aviation Administration. 2019. Building your operational risk assessment. https://www.faa.gov/uas/resources/events_calendar/archive/2019_uas_symposium/media/Building_Your_Operational_Risk_Assessment.pdf Federal Aviation Administration. 2019. Building your operational risk assessment. https://www.faa.gov/uas/resources/events_calendar/archive/2019_uas_symposium/media/Building_Your_Operational_Risk_Assessment.pdf
2. Federal Aviation Administration. 2019. Part 107 Waiver. https://www.faa.gov/uas/commercial_operators/part_107_waivers/ Federal Aviation Administration. 2019. Part 107 Waiver. https://www.faa.gov/uas/commercial_operators/part_107_waivers/
3. Leveraging Artifact Trees to Evolve and Reuse Safety Cases
4. Unmanned Airspace. 2021. BVLOS operations will become more regular. https://www.unmannedairspace.info/latest-news-and-information/bvlos-operations-will-become-more-regular-says-drone-industry-insights-report/ Unmanned Airspace. 2021. BVLOS operations will become more regular. https://www.unmannedairspace.info/latest-news-and-information/bvlos-operations-will-become-more-regular-says-drone-industry-insights-report/
5. Ahmed Alamouri , Astrid Lampert , and Markus Gerke . 2021. An Exploratory Investigation of UAS Regulations in Europe and the Impact on Effective Use and Economic Potential. Drones 5, 3 ( 2021 ). https://doi.org/10.3390/drones5030063 10.3390/drones5030063 Ahmed Alamouri, Astrid Lampert, and Markus Gerke. 2021. An Exploratory Investigation of UAS Regulations in Europe and the Impact on Effective Use and Economic Potential. Drones 5, 3 (2021). https://doi.org/10.3390/drones5030063