Som, S. M.; Catling, D. C.; Harnmeijer, J. P.; Polivka, P. M.; Buick, R. (2012). "Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints". Nature. 484 (7394): 359–362. Bibcode:2012Natur.484..359S. doi:10.1038/nature10890. PMID22456703. S2CID4410348.
Som, S. M.; Buick, R.; Hagadorn, J. W.; Blake, T. S.; Perrault, J. M.; Harnmeijer, J. P.; Catling, D. C. (2012). "Earth's air pressure 2.7 billion years ago constrained to less than half of modern levels". Nature Geoscience. 9 (6): 448–451. Bibcode:2016NatGe...9..448S. doi:10.1038/ngeo2713. S2CID4662435.
Hecht, M. H.; Kounaves, S. P.; Quinn, R. C.; West, S. J.; Young, S. M. M.; Ming, D. W.; Catling, D. C.; Clark, B. C.; Boynton, W. V.; Hoffman, J.; DeFlores, L. P.; Gospodinova, K.; Kapit, J.; Smith, P. H. (2009). "Detection of perchlorate and soluble chemistry of martian soil: Findings from the Phoenix Mars Lander". Science. 325 (5936): 64–67. Bibcode:2009Sci...325...64H. doi:10.1126/science.1172466. PMID19574385. S2CID24299495.
Som, S. M.; Catling, D. C.; Harnmeijer, J. P.; Polivka, P. M.; Buick, R. (2012). "Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints". Nature. 484 (7394): 359–362. Bibcode:2012Natur.484..359S. doi:10.1038/nature10890. PMID22456703. S2CID4410348.
Som, S. M.; Buick, R.; Hagadorn, J. W.; Blake, T. S.; Perrault, J. M.; Harnmeijer, J. P.; Catling, D. C. (2012). "Earth's air pressure 2.7 billion years ago constrained to less than half of modern levels". Nature Geoscience. 9 (6): 448–451. Bibcode:2016NatGe...9..448S. doi:10.1038/ngeo2713. S2CID4662435.
Hecht, M. H.; Kounaves, S. P.; Quinn, R. C.; West, S. J.; Young, S. M. M.; Ming, D. W.; Catling, D. C.; Clark, B. C.; Boynton, W. V.; Hoffman, J.; DeFlores, L. P.; Gospodinova, K.; Kapit, J.; Smith, P. H. (2009). "Detection of perchlorate and soluble chemistry of martian soil: Findings from the Phoenix Mars Lander". Science. 325 (5936): 64–67. Bibcode:2009Sci...325...64H. doi:10.1126/science.1172466. PMID19574385. S2CID24299495.
Som, S. M.; Catling, D. C.; Harnmeijer, J. P.; Polivka, P. M.; Buick, R. (2012). "Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints". Nature. 484 (7394): 359–362. Bibcode:2012Natur.484..359S. doi:10.1038/nature10890. PMID22456703. S2CID4410348.
Hecht, M. H.; Kounaves, S. P.; Quinn, R. C.; West, S. J.; Young, S. M. M.; Ming, D. W.; Catling, D. C.; Clark, B. C.; Boynton, W. V.; Hoffman, J.; DeFlores, L. P.; Gospodinova, K.; Kapit, J.; Smith, P. H. (2009). "Detection of perchlorate and soluble chemistry of martian soil: Findings from the Phoenix Mars Lander". Science. 325 (5936): 64–67. Bibcode:2009Sci...325...64H. doi:10.1126/science.1172466. PMID19574385. S2CID24299495.
Som, S. M.; Catling, D. C.; Harnmeijer, J. P.; Polivka, P. M.; Buick, R. (2012). "Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints". Nature. 484 (7394): 359–362. Bibcode:2012Natur.484..359S. doi:10.1038/nature10890. PMID22456703. S2CID4410348.
Som, S. M.; Buick, R.; Hagadorn, J. W.; Blake, T. S.; Perrault, J. M.; Harnmeijer, J. P.; Catling, D. C. (2012). "Earth's air pressure 2.7 billion years ago constrained to less than half of modern levels". Nature Geoscience. 9 (6): 448–451. Bibcode:2016NatGe...9..448S. doi:10.1038/ngeo2713. S2CID4662435.
Hecht, M. H.; Kounaves, S. P.; Quinn, R. C.; West, S. J.; Young, S. M. M.; Ming, D. W.; Catling, D. C.; Clark, B. C.; Boynton, W. V.; Hoffman, J.; DeFlores, L. P.; Gospodinova, K.; Kapit, J.; Smith, P. H. (2009). "Detection of perchlorate and soluble chemistry of martian soil: Findings from the Phoenix Mars Lander". Science. 325 (5936): 64–67. Bibcode:2009Sci...325...64H. doi:10.1126/science.1172466. PMID19574385. S2CID24299495.