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Mass extinction of birds at the Cretaceous–Paleogene (K–Pg)..:

Longrich, Nicholas R. ; Tokaryk, Tim ; Field, Daniel J.
Proceedings of the National Academy of Sciences.  108 (2011)  37 - p. 15253-15257 , 2011
Link: https://doi.org/10.1073/pnas.1110395108