http://evolution.berkeley.edu/evosite/evo101/VADefiningSpecies.shtml
http://www.uv.mx/personal/tcarmona/files/2010/08/Wu-2001b.pdf
http://en.wikipedia.org/wiki/Gene_flow
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Speciation.html
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