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Francey, R. J.; Allison, C. E.; Etheridge, D. M.; Trudinger, C. M.; Enting, I. G.; Leuenberger, M.; Langenfelds, R. L.; Michel, E.; Steele, L. P. (1999). A 1000-year high precision record of δ13C in atmospheric CO2. Tellus. Series B - chemical and physical meteorology, 51(2), pp. 170-193. Munksgaard 10.3402/tellusb.v51i2.16269
