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Siegenthaler, U. (1984). 19th century measurements of atmospheric CO2 - A comment. Climatic change, 6(4), pp. 409-411. Reidel 10.1007/BF00212635
Oeschger, H.; Siegenthaler, U.; Heimann, M. (1980). The carbon cycle and its perturbation by man. In: Bach, W.; Pankrath, J.; Williams, J. (eds.) Interactions of energy and climat (pp. 107-127). Reidel 10.1007/978-94-009-9111-8_6
