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http://dx.doi.org/10.1046/j.0269-8463.2001.00591.x (Verlagsversion)
Buchmann, N., Brooks, J. R., & Ehleringer, J. R. (2002). Predicting daytime carbon isotope ratios of atmospheric CO2 within forest canopies. Functional Ecology, 16(1), 49-57. doi:10.1046/j.0269-8463.2001.00591.x.