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\bibitem{Bonal_etal2011} Bonal, D., Ponton, S., Le Thiec, D., Richard, B., Ningre, N., Herault, B., et al. (2011). Leaf functional response to increasing atmospheric CO(2) concentrations over the last century in two northern Amazonian tree species: a historical delta(13)C and delta(18)O approach using herbarium samples. \textit{Plant Cell Environ.}, \textit{34}(8), 1332--1344.

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