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\bibitem{Prevost-Boure_etal2009} Prevost-Boure, N. C., Ngao, J., Berveiller, D., Bonal, D., Damesin, C., Dufrene, E., et al. (2009). Root exclusion through trenching does not affect the isotopic composition of soil CO2 efflux. \textit{Plant Soil}, \textit{319}(1-2), 1--13.

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