1. Making life multi-planetary;Musk;NEW SPACE,2018
2. https://www.youtube.com/watch?v=zqE-ultsWt0.
3. N.N.: BECOMING A MULTIPLANET SPECIES, presentation by SpaceX, 2017.
4. Comparative study on options for high-speed intercontinental passenger transports: air-breathing- vs. rocket-propelled;Sippel,2005
5. The SpaceLiner concept and its aerothermodynamic challenges, 1st ARA-days;Sippel;Arcachon,2006