1. Aoki S (2012) The Function of ‘Soft Law’ in the Development of International Space Law. In: Marboe I (ed) Soft Law in Outer Space: The Function of Non-binding Norms in International Space Law. Studien zu Politik und Verwaltung, vol. 102, Böhlau Verlag, Vienna, 57–85
2. Benkö M, Gruber G, Schrogl K-U (1993) The UN Committee on the Peaceful Uses of Outer Space: Adoption of Principles Relevant to the Use of Nuclear Power Sources in Outer Space and Other Recent Developments. Zeitschriftfür Luft-und Weltraumrecht, 35–47
3. Bianchi A (1991) Environmental Harm Resulting from the Use of Nuclear Power Sources in Outer Space: Some Remarks on State Responsibility and Liability. In: Francioni F, Scovazzi T (eds) International Responsibility for Environmental Harm. Graham & Trotman, London/Dordrecht/Boston
4. Bohlmann U, Summerer L (2015) A Distinct NPS Safety Document: The Safety Framework for Nuclear Power Source Applications in Outer Space. In: Hobe S et al (eds) Cologne Commentary on Space Law, Vol III. Carl Heymanns Verlag, Cologne, 278–297
5. Caselli LP (2012) Space Demilitarization Treaties in a New Era of Manned Nuclear Spaceflights. 77 Journal of Air Law and Commerce 641