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Knutti D, Kressler D, Kralli A.Knutti D, et al.Proc Natl Acad Sci U S A. 2001 Aug 14;98(17):9713-8. doi: 10.1073/pnas.171184698. Epub 2001 Jul 31.Proc Natl Acad Sci U S A. 2001.PMID: 11481440Free PMC article.
Duong HA, Robles MS, Knutti D, Weitz CJ.Duong HA, et al. Among authors: knutti d.Science. 2011 Jun 17;332(6036):1436-9. doi: 10.1126/science.1196766.Science. 2011.PMID: 21680841Free PMC article.