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Siegenthaler, Ulrich (1989). Anthropogenic and natural perturbations of the carbon cycle. In: Berger, A.; Schneider, S.; Duplessy, J. Cl. (eds.) Climate and Geo-Sciences. NATO ASI Series. B, Physics: Vol. 285 (pp. 475-480). Springer 10.1007/978-94-009-2446-8_27
