1. About Travel: https://abouttravel.ch/reisebranche/kreuzfahrtschiffe-und-die-klimafrage-erste-brennstoffzellen-tests-kommen/. Accessed: 5. Oct. 2022
2. Airbus: https://www.airbus.com/en/newsroom/news/2020-10-hydrogen-fuel-cells-explained. Accessed: 5. Oct. 2022
3. Daimler Truck: https://media.daimlertruck.com/marsMediaSite/en/instance/ko/Development-milestone-Daimler-Truck-tests-fuel-cell-truck-with-liquid-hydrogen.xhtml?oid=51975637. Accessed: 5. Oct. 2022
4. Freudenberg: https://www.fst.com/de/fuel-cell/. Accessed: 5. Oct. 2022
5. Weiss, E., Schnorpfeil, S., Nickel, D.: Fuel Cell System Integration for Heavy-Duty Applications. In: ATZ Heavy Duty Conference, Rostock (2021)