4Stephan Hobe,Legal Aspects of Space Tourism,Conference on Security and Risk Management in a New Space Era:Military,Commercial,and Tourism Dimensions[C] ,Nebraska Law Review,2007:441-446.
6Dr.Frans G.von der Dunk,Passing The Buck to Rogers:International Liability Issues in Private Spaceflight,Conference on Security and Risk Management in a New Space Era:Military,Commercial,and Tourism Dimensions[C] ,Nebraska Law Review,2007:448.