1. ACARE (2018) Protecting the environment and the energy supply. http://www.acare4europe.org/sria/flightpath-2050-goals/protecting-environment-and-energy-supply-0
2. ACS Aviation (2019) EACS SORA-e. https://acs-solutions.com.br/index.php/produtos
3. AeroVironment. (2020). $$\text{PUMA}^{TM}$$ 3AE. https://www.avinc.com/tuas/puma-ae
4. AIN/McIntosh, D., Alcock, C. (2020). Eviation’s electric Alice aircraft catches fire during ground tests. AIN online https://www.ainonline.com/aviation-news/business-aviation/2020-01-24/eviations-electric-alice-aircraft-catches-fire-during-ground-tests
5. Airbus. (2017). Airbus, Rolls Royce and Siemens team up for electric future Partnership launches E-FAN X hybrid electric flight demonstrator. https://www.airbus.com/newsroom/press-releases/en/2017/11/airbus--rolls-royce--and-siemens-team-up-for-electric-future-par.html