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References
- ↑ "FAST20XX (Future High-Altitude High-Speed Transport 20XX)". ESA. Retrieved December 5, 2022.
- ↑ "FAST20XX (Future High-Altitude High-Speed Transport 20XX)". ESA. 16 December 2009.
- ↑ Sippel, M. (2009). "SpaceLiner - a Visionary Concept of an Ultra Fast Passenger Transport under Investigation in FAST20XX". 16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference (PDF). 16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference. doi:10.2514/6.2009-7439. ISBN 978-1-60086-968-6 . Retrieved December 5, 2022.
- ↑ M. Sippel; et al. (2012). "Technical Maturation of the SpaceLiner Concept". 18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference (PDF). 18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference. 2012. doi:10.2514/6.2012-5850. ISBN 978-1-60086-931-0 . Retrieved 2013-04-22.
