1.
European Commission. Flightpath 2050 Europe’s Vision for Aviation. (2011).
2.
Strategic Research & Innovation Agenda 2017 Update. vol. 1 (2017).
3.
Aerospace Technology Institute. Raising Ambition, Technology Strategy and Portfolio Update 2016. (2016).
4.
Clean Sky 2. Clean Sky 2 Joint Undertaking Development Plan.
5.
NASA. NASA Technology Roadmaps TA15 Aeronautics. (2015).
6.
NASA. NASA Aeronautics Strategic Implementation Plan. (2017).