Barbour, R. C., J. M.  O'Reilly-Wapstra, D. W.  De Little, G. J.  Jordan, D. A.  Steane, J. R.  Humphreys, J. K.  Bailey, T. G.  Whitham, and B. M.  Potts. 2009. A geographic mosaic of genetic variation within a foundation tree species and its community-level consequences.. Ecology 90:1762 - 72.