1. NASA and China are Eyeing the Same Landing Sites Near the Lunar South Pole,2022
2. Strange Russian spacecraft shadowing U.S. spy satellite, general says;Hennigan;Time,2020
3. “China, US space rivalry may heat up after NASA's Artemis Accords sign, analysts say;Zhen;South China Morning Post,2020
4. Protecting space assets: a legal analysis of ‘keep-out zones;Kenneth Schwetje;J. Space L.,1987
5. Space governance in the new space era;Oltrogge;J. Space Saf. Eng.,2020