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"The Utility of Geothermal Energy on Mars," JBIS, 49, 403-422 (1996).
"The Ethical Dimensions of Space Settlement," IAA-99-IAA.7.1.07 presented at the 50th International Astronautical Congress, Amsterdam (1999); Space Policy, 16, 205-211 (2000). "Can Terrestrial Planets Form in Hot-Jupiter Systems?" in D. Fischer et al., "Extreme Solar Systems, " ASP Conference Series, 398, 525-528 (2008). |