[url=http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v367/n6459/full/367153a0.html&filetype=pdf]
web-ссылка
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White J.W.C., P. Ciais R. A. Figge R. Kenny & V. Markgraf. A high-resolution record of atmospheric CO2 content from carbon isotopes in pet. Nature. 1994; 367(6459):153-156

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