Brusatte, S.L., Lloyd, G.T., Wang, S.C., & Norell, M.A. (2014). Gradual Assembly of Avian Body Plan Culminated in Rapid Rates of Evolution across the Dinosaur-Bird Transition. Current Biology, 24(20), https://doi.org/10.1016/j.cub.2014.08.034
Chiappe, L.M. (2009). Downsized Dinosaurs: The Evolutionary Transition to Modern Birds. Evo Edu Outreach, 2, 248–256. https://doi.org/10.1007/s12052-009-0133-4
Prum, R., Berv, J., Dornburg, A. et al. (2015). A comprehensive phylogeny of birds (Aves) using targeted next-generation DNA sequencing. Nature, 526, 569–573. https://doi.org/10.1038/nature15697