Links
[1] https://hootsgo.org/?q=node/6343
[2] http://evolution.berkeley.edu/evosite/evo101/VADefiningSpecies.shtml
[3] http://www.uv.mx/personal/tcarmona/files/2010/08/Wu-2001b.pdf
[4] http://en.wikipedia.org/wiki/Gene_flow
[5] http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Speciation.html