1. The Global Exploration Roadmap,2012
2. NASA, “Gateway” (2023); available from https://www.nasa.gov/mission/gateway/
3. D. M.
Bushnell
and R. W.Moses, “Frontier in-situ resource utilization for enabling sustained human presence on Mars,” in Report No. NF176L-20756 (NASA, 2016).
4. Mars sample return as a campaign