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Ferris, J.P. (June 1999). "Prebiotic Synthesis on Minerals: Bridging the Prebiotic and RNA Worlds". Biological Bulletin. Evolution: A Molecular Point of View. 196 (3): 311–314. doi:10.2307/1542957. JSTOR1542957. PMID10390828.
Forterre, Patrick (2005). "The two ages of the RNA world, and the transition to the DNA world: a story of viruses and cells". Biochimie. 87 (9–10): 793–803. doi:10.1016/j.biochi.2005.03.015. PMID16164990.
Ferris, J.P. (June 1999). "Prebiotic Synthesis on Minerals: Bridging the Prebiotic and RNA Worlds". Biological Bulletin. Evolution: A Molecular Point of View. 196 (3): 311–314. doi:10.2307/1542957. JSTOR1542957. PMID10390828.
Heckman, D.S.; D.M. Geiser; B.R. Eidell; R.L. Stauffer; N.L. Kardos; S.B. Hedges (August 10, 2001). "Molecular evidence for the early colonization of land by fungi and plants". Science. 293 (5532): 1129–1133. doi:10.1126/science.1061457. PMID11498589. S2CID10127810. (abstract)
Landing, E.; Bowring, S.A.; Davidek, K.L.; Fortey, R.A.; Wimbledon, W.A.P. (2000). "Cambrian–Ordovician boundary age and duration of the lowest Ordovician Tremadoc Series based on U–Pb zircon dates from Avalonian Wales". Geological Magazine. 137 (5): 485–494. Bibcode:2000GeoM..137..485L. doi:10.1017/S0016756800004507. S2CID130330110. (abstract)
Heckman, D.S.; D.M. Geiser; B.R. Eidell; R.L. Stauffer; N.L. Kardos; S.B. Hedges (August 10, 2001). "Molecular evidence for the early colonization of land by fungi and plants". Science. 293 (5532): 1129–1133. doi:10.1126/science.1061457. PMID11498589. S2CID10127810. (abstract)
Nield, Ted (2009). "Moonwalk"(PDF). Geoscientist. 18 (9). Geological Society of London: 8. Archived from the original(PDF) on June 5, 2011. Retrieved April 18, 2012.