1. Analysis of RSO’s close approaches with the ISS during two years flight;Agapov,2001
2. Investigations of the feasibility of a European space surveillance system;Klinkrad,2007
3. System of systems architecture: The case of space situational awareness;Shah,2007
4. Legal and policy aspects of space situational awareness;Kaiser;Space Policy,2015
5. Enabling orbit determination of space debris using narrowband radar;Grassi;IEEE Trans. Aerosp. Electron. Syst.,2015