1. Drone Industry Insights (2022, December 14). Quantitative Analysis of the German Drone Market. Available online: https://www.verband-unbemannte-luftfahrt.de/wp-content/uploads/2021/05/VUL-Markststudie_2021_EN1.pdf.
2. Aviation Safety Network (2022, November 04). (Suspected) Drone Collisions with Aircraft. Available online: https://aviation-safety.net/database/issue/drones.php.
3. European Commission (2022, December 14). Commission Implementing Regulation (EU) 2019/947 of 24 May 2019 on the Rules and Procedures for the Operation of Unmanned Aircraft. Available online: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32019R0947.
4. European Commission (2022, December 14). Commission Implementing Regulation (EU) 2021/664 of 22 April 2021 on a Regulatory Framework for the U-Space. Available online: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32021R0664&qid=1671025920575.
5. ADAC Luftrettung gGmbH (2022, November 04). Einsätze der ADAC Rettungshubschrauber. Available online: https://luftrettung.adac.de/app/uploads/2018/11/Einsatzverlauf_1970_2016.pdf.