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4. Could the early environment of Mars have supported the development of life? McKay CP, Stoker CR. Earth Space; 1990 Jan; 2(5):10-2. PubMed ID: 11538711 [Abstract] [Full Text] [Related]
5. Did Mars once have martians? McKay CP. Astronomy; 1993 Sep; 21():27-33. PubMed ID: 11540045 [Abstract] [Full Text] [Related]
6. Mars exploration: going underground. Reichhardt T. Nature; 2005 May 19; 435(7040):266-7. PubMed ID: 15902222 [No Abstract] [Full Text] [Related]
8. Making Mars habitable. McKay CP, Toon OB, Kasting JF. Nature; 1991 Aug 08; 352():489-96. PubMed ID: 11538095 [Abstract] [Full Text] [Related]
9. Life as a planetary phenomenon: the colonization of Mars. Margulis L, Guerrero R. Microbiologia; 1995 Aug 08; 11():173-84. PubMed ID: 11539563 [Abstract] [Full Text] [Related]
14. A search for life on Earth from the Galileo spacecraft. Sagan C, Thompson WR, Carlson R, Gurnett D, Hord C. Nature; 1993 Oct 21; 365(6448):715-21. PubMed ID: 11536539 [Abstract] [Full Text] [Related]
15. The physics, biology, and environmental ethics of making mars habitable. McKay CP, Marinova MM. Astrobiology; 2001 Oct 21; 1(1):89-109. PubMed ID: 12448997 [Abstract] [Full Text] [Related]