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nih.gov
pubmed.ncbi.nlm.nih.gov
Abramov، O.؛ Mojzsis، S.J. (2009). "Microbial Habitability of the Hadean Earth During the Late Heavy Bombardment". Nature. ج. 459: 419–422. DOI:10.1038/nature08015. PMID:19458721.
Malin، M.C.؛ Edgett، K.S. (2003). "Evidence for Persistent Flow and Aqueous Sedimentation on Early Mars". Science. ج. 302: 1931–1934. DOI:10.1126/science.1090544. PMID:14615547.