1. Effects of novel coronavirus (COVID-19) on civil aviation: Economic impact analysis;ICAO Unitin Aviation;Econ Dev Air Transp Bureau,2022
2. Jane’s all the world’s aircraft 2004–2005;Jackson,2004
3. Easy access rules for very light rotorcraft;European Union Aviation Safety Agency,2023
4. 2050 Long-term strategy;European Comission,2023
5. Comparative global warming impact and NOX emissions of conventional and hydrogen automotive propulsion systems;Desantes;Energy Convers Manage,2020