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2. P.G. Dembling, D.M. Arons, The evolution of the outer space treaty, J. Air Law Comm. 33, 419–456, 1967, reprinted in Space Law, Francis Lyall and Paul B. Larsen (eds), Ashgate, 2007, pp. 151–188.
3. How shall we live in space? Culture, law and ethics in spacefaring society;Billings;Space Policy,2006
4. Status of NASA׳s commercial cargo and crew transportation initiative;Lindenmoyer;Acta Astronaut.,2010
5. CASH 2021: commercial access and space habitation;Aldrin;Acta Astronaut.,2002