1. Easy approach to requirements syntax (EARS);Mavin,2009
2. Lifing methods and safety criteria in aero gas turbines;Corran;Engineering Failure Analysis,2007
3. Certification rules and standards review;Schlickenmaier,2019
4. Elliger T, Klein G, Zapf B. International symposium and workshop on fuel cells and hydrogen for aerospace and maritime applications 16-17 september 2004, (Hamburg).
5. Klein G, Elliger T, Zapf B. Hydrogen technology–ready for take-off–hydrogen applications in aerospace industry.