4 (2): 137–167. Bibcode:2004AsBio...4..137B. doi:10.1089/153110704323175124. PMID 15253836. ↑ Committee on the Limits of Organic Life in Planetary Systems, Committee on the Origins and Evolution of Life, National Research Council; The Limits of Organic Life in Planetary Systems; The National Academies Press, 2007. ↑ Committee on the Limits of Organic Life in Planetary Systems, Committee on the Origins and Evolution of Life, National Research Council; The Limits of Organic Life in Planetary Systems; The National Academies Press, 2007; page 5 ↑ Feinberg, Gerald; Robert Shapiro (1980).