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Friedli, H.; Lötscher, H.; Oeschger, H.; Siegenthaler, U.; Stauffer, B. (1986). Ice core record of the 13C/12C ratio of atmospheric CO2 in the past two centuries. Nature, 324(6094), pp. 237-238. Macmillan Journals Ltd. 10.1038/324237a0
Neftel, A.; Friedli, H.; Moor, E.; Lötscher, H.; Oeschger, H.; Siegenthaler, U.; Stauffer, B. (1994). Historical CO2 record from the Siple Station ice core. In: Boden, Thomas A.; Kaiser, Dale P.; Sepanski, Robert J.; Stoss, Frederick W. (eds.) Trends '93: A Compendium of Data on Global Change. ESD Publication: Vol. 4195 (pp. 11-14). Carbon Dioxide Information Analysis Center
