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External links

* Funk, D. J., and Omland, K. E. (2003). "Species-level paraphyly and polyphyly: Frequency, cause and consequences, with insights from animal mitochondrial DNA" Annu. Rev. Ecol. Evol. Syst. 34: 397-423. at ftp://137.110.142.4/users/bhhanser/Subspecies%20general%20literature/FunkEtal2003AnnuRevEcolEvolV34pp397-423.pdf

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