* Fain, Matthew G. & Houde, Peter ( 2004 ): Parallel radiations in the primary clades of birds.
* Fain, Matthew G. & Houde, Peter ( 2004 ): Parallel radiations in the primary clades of birds.
* Fain, Matthew G. & Houde, Peter ( 2004 ): Parallel radiations in the primary clades of birds.
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