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\bibitem{Clair_etal2006} Clair, B., Ruelle, J., Beauchene, J., Prevost, M. F., \& Fournier, M. (2006). Tension wood and opposite wood in 21 tropical rain forest species 1. Occurrence and efficiency of the G-layer. \textit{IAWA J.}, \textit{27}(3), 329--338.

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