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ncbi.nlm.nih.gov
Julia A. Clarke, Claudia P. Tambussi, Jorge I. Noriega, Gregory M. Erickson, Richard A. Ketcham. "Definitive fossil evidence for the extant avian radiation in the Cretaceous". Nature. 433. 2005: 305–308. doi:10.1038/nature03150. PMID15662422.
