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\bibitem{Siefert_etal2015} Siefert, A., Violle, C., Chalmandrier, L., Albert, C. H., Taudiere, A., Fajardo, A., et al. (2015). A global meta-analysis of the relative extent of intraspecific trait variation in plant communities. \textit{Ecology Letters}, \textit{18}(12), 1406--1419.

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