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\bibitem{Sarmiento_etal2011} Sarmiento, C., Patino, S., Paine, C. E. T., Beauchene, J., Thibaut, A., \& Baraloto, C. (2011). Within-Individual Variation of Trunk and Branch Xylem Density in Tropical Trees. \textit{Am. J. Bot.}, \textit{98}(1), 140--149.

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