1. International Civil Aviation Organization ICAO, "Report on Agenda Item 17: Environmental Protection - International Aviation and Climate Change," Assembly Report A41-WP/658 P/54, ICAO,Montreal, Canada, 2022. URL https://www.icao.int/ Meetings/a41/Documents/WP/wp_658_en.pdf, 41st Session of theICAO Assembly.
2. Hydrogen fueled and cooled gas turbine engine