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<ref name=Kasting93>{{Cite journal|last=Kasting|first=James F.|title=Earth's early atmosphere|journal=Science|year=1993|volume=259|pages=920–926|doi=10.1126/science.11536547|issue=5097|ref=harv|pmid=11536547}}</ref>
<ref name=Gale>{{Cite book|last=Gale|first=Joseph|title=Astrobiology of Earth : the emergence, evolution, and future of life on a planet in turmoil|year=2009|publisher=Oxford University Press|location=Oxford|isbn=978-0-19-920580-6}}</ref>
<ref name=Kasting-2006>{{cite journal|url=http://www3.geosc.psu.edu/~jfk4/PersonalPage/Pdf/Phl_Trans_B%20(Kasting&Howard)_06.pdf|title=Atmospheric composition and climate on the early Earth|last=Kasting|first=James F.|coauthors=M. Tazewell Howard|journal=[[Philosophical Transactions of the Royal Society B]]|volume=361|issue=361|pages=1733–1742|doi=10.1098/rstb.2006.1902|date=September 7, 2006|ref=harv|access-date=2022-03-15|archive-date=2012-04-19|archive-url=https://web.archive.org/web/20120419011108/http://www3.geosc.psu.edu/~jfk4/PersonalPage/Pdf/Phl_Trans_B%20%28Kasting%26Howard%29_06.pdf|dead-url=yes}}</ref>
<ref name=Kasting03>{{Cite journal|last=Kasting|first=James F.|coauthors=Catling, David|title=Evolution of a habitable planet|journal=Annual Review of Astronomy and Astrophysics|volume=41|issue=1|pages=429–463|year=2003|doi=10.1146/annurev.astro.41.071601.170049|bibcode = 2003ARA&A..41..429K }}</ref>
<ref name="Sagan">{{cite journal|author=Sagan, Carl; Mullen, George|date=July 7, 1972|title=Earth and Mars: Evolution of Atmospheres and Surface Temperatures|url=https://archive.org/details/sim_science_1972-07-07_177_4043/page/52|journal=Science|volume=177|issue=4043|pages=52–56|doi=10.1126/science.177.4043.52|pmid=17756316|bibcode=1972Sci...177...52S|ref=harv}}</ref>
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