1. Abraham, A. ‘GPS Transponders for Space Traffic Management’ The Center for Space Policy and Strategy. The Aerospace Corporation, April 2018 <https://csps.aerospace.org/papers/gps-transponders-space-traffic-management> accessed 4 July 2021.
2. Acton, J. M. ‘Why is Nuclear Entanglement So Dangerous? Carnegie Endowment for International Peace’ (23 January 2019) <https://carnegieendowment.org/2019/01/23/why-is-nuclear-entanglement-so-dangerous-pub-78136> accessed 19 August 2020.
3. Aoki, S. ‘Law and Military Uses of Outer Space’ in R. S. Jakhu and P. S. Dempsey (eds), Routledge Handbook of Space Law (Routledge, 2017) 197–224.
4. Bank of America Merrill Lynch. ‘To Infinity and Beyond—Global Space Primer’ (October 2019) Thematic Investing <https://newspaceglobal.com/wp-content/uploads/imce/u3479/MerrillLynchSpace-Oct2017.pdf> accessed 17 August 2021.