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\bibitem{Christensen-Dalsgaard_etal2008} Christensen-Dalsgaard, K. K., Ennos, A. R., \& Fournier, M. (2008). Are radial changes in vascular anatomy mechanically induced or an ageing process? Evidence from observations on buttressed tree root systems. \textit{Trees-Struct. Funct.}, \textit{22}(4), 543--550.

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