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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
Friedli, H.; Siegenthaler, U. (1989). Influence of N2O on isotope analyses in CO2 and mass-spectrometric determination of N2O in air samples. Tellus. Series B - chemical and physical meteorology, 41(2), pp. 129-133. Munksgaard 10.3402/tellusb.v41i2.15633
Siegenthaler, U.; Friedli, H.; Loetscher, H.; Moor, E.; Neftel, A.; Oeschger, H.; Stauffer, B. (1988). Stable-isotope ratios and concentration of CO2 in air from polar ice cores. Annals of glaciology, 10, pp. 151-156. International Glaciological Society 10.3189/S0260305500004341
Friedli, H.; Siegenthaler, U.; Rauber, D.; Oeschger, H. (1987). Measurements of concentration, 13C/12C and 18O/16O ratios of tropospheric carbon dioxide over Switzerland. Tellus. Series B - chemical and physical meteorology, 39(1-2), pp. 80-88. Munksgaard 10.3402/tellusb.v39i1-2.15325
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
Friedli, H.; Moor, E.; Oeschger, H.; Siegenthaler, U.; Stauffer, B. (1984). 13C/12C ratios in CO2 extracted from Antarctic ice. Geophysical Research Letters, 11(11), pp. 1145-1148. American Geophysical Union 10.1029/GL011i011p01145