1. NASA, NASA’s Plan for Sustained Lunar Exploration and Development, National Aeronautics and Space Administration, 2020; Available from: https://www.nasa.gov/sites/default/files/atoms/files/a_sustained_lunar_presence_nspc_report4220final.pdf.
2. L. Xu, Y. Zou, Y. Jia, China's Planning for Deep Space Exploration and Lunar Exploration before 2030, Chinese Journal of Space Science, 38 (2018) 591-592. DOI: https://doi.org/10.11728/cjss2018.05.591.
3. ESA, ESA Space Resources Strategy, European Space Agency, 2019; Available from: https://sci.esa.int/documents/34161/35992/1567260390250-ESA_Space_Resources_Strategy.pdf.
4. International Space Exploration Group, The Global Exploration Roadmap, International Space Exploration Group Washington, 2018; Available from: https://www.nasa.gov/sites/default/files/atoms/files/ger_2018_small_mobile.pdf.
5. D. Vaniman, R. Reedy, G. Heiken, G. Olhoeft, W. Mendell, The lunar environment, in: G.H. Heiken, D.T. Vaniman, and B.M. French (Eds.), The Lunar sourcebook: A user's guide to the moon, Cambridge University Press, New York, 1991, p. 27-60.