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Rafael Maia, Dustin R. Rubenstein, Matthew D. Shawkey: Key ornamental innovations facilitate diversification in an avian radiation. In: Proceedings of the National Academy of Sciences. Band110, Nr.26, 25. Juni 2013, ISSN0027-8424, S.10687–10692, doi:10.1073/pnas.1220784110 (pnas.org).