Niklaus E. Zimmermann, Nigel G. Yoccoz, Thomas C. Edwards, Jr., Eliane S. Meier, Wilfried Thuiller, Antoine Guisan, Dirk R. Schmatz and Peter B. Pearman (2009) Climatic extremes improve predictions of spatial patterns of tree speciesProc.Nat.Acad.Sci. USA 106: 19723-19728. http://www.wsl.ch/staff/niklaus.zimmermann/papers/PNAS_Zimmermann_2009.pdf