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Saurer, M.; Siegenthaler, U.; Schweingruber, F. (1995). The climate-carbon isotope relationship in tree rings and the sifnificance of site conditions. Tellus. Series B - chemical and physical meteorology, 47(3), pp. 320-330. Munksgaard 10.3402/tellusb.v47i3.16051
Leuenberger, M.; Borella, S.; Stocker, T.; Saerer, M.; Siegwolf, R.; Schweingruber, F.; Matyssek, R. (eds.) (1998). Stable isotopes in tree rings as climate and stress indicators. Final report NFP 31. vdf Hochschulverlag