Lavric, J. V.Barnola, J. M.Chappellaz, J.Leunberger, M. C.Fischer, H.Raynaud, D.2022-11-232022-11-232022-11-232005-05-01https://infoscience.epfl.ch/handle/20.500.14299/192618WOS:000229399700547delta C-13 of carbon dioxide in ancient air from ice core samplestext::journal::journal article::research article