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References
Zwicky, F. Observatory 68, 121 (1948).
Sagan, C. Science 133, 849 (1961).
Allaby, M. & Lovelock, J. The Greening of Mars (Deutsch, London, 1984).
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CRAWFORD, I. Colonizing space. Nature 326, 822 (1987). https://doi.org/10.1038/326822e0
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DOI: https://doi.org/10.1038/326822e0