1. Meta-Geopolitics of Outer Space: an Analysis of Space Power, Security and Governance;Al-Rodhan,2012
2. What’s in a word? Notions of ‘Security’ and ‘Safety’ in the Space Context;Zarkan Cesari,2020
3. Defining space security;Sheehan,2015
4. EU SST, EU space surveillance & tracking: service portfolio, 2020. Available online https://sst.satcen.europa.eu/idp/Acct/ServicePortfolio (accessed 12 April 2021).
5. European space surveillance and tracking support framework;Peldszus,2020