Notes
(1) E. M. Goolish, Astrobiology 1, 292 (2001).
(2) D. J. Des Marais et al., Astrobiology 3, 210 (2003).
(3) NASA Astrobiology Institute http://nai.arc.nasa.gov
(4) E. E. Prather, T. F. Slater, Astrobiology 2, 215 (2002).
(5) TERC Astrobiology An Integrated Science Approach http://astrobio.terc.edu
(6) D. J. Des Marais, W. M. R. Walter, Annual Review of Ecology and Systematics 30, 397 (1999).
(7) R. A. Freedman, Universe (Freeman, New York, ed. 7, 2005).
(8) J. F. Kasting, D. Catling, Annual Review of Astronomy and Astrophysics 41, 429 (2003).
Comments: