Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a publisher retraction,
withdrawal, or removal notice.
The 12 references without a DOI — listed, not checked
no DOI — not checkedL. M. Chiappe, 1996 .Late Cretaceous birds of southern South America: anatomy and systematics of Enantiornithes and Patagopteryx deferrariisi., Münch. Geowiss. Abh. (A), 30 :203 –244 .
no DOI — not checkedA. Elzanowski, 1974 .Preliminary note on the palaeonathous birds from the Upper Cretaceous of Mongolia. Results of the Polish–Mongolian Paleontological Expeditions—Part V., Palaeontol. Pol, 30 :103 –109 .
no DOI — not checkedA. Elzanowski, 1977 .Skulls of Gobipteryx (Aves) from the Upper Cretaceous of Mongolia. Results of the Polish–Mongolian Paleontological Expeditions—Part VII., Palaeontol. Pol, 37 :153 –165 .
no DOI — not checkedA. Elzanowski, 1981 .Embryonic bird skeletons from the Late Cretaceous of Mongolia., Palaeontol. Pol, 42 :147 –176 .
no DOI — not checkedA. Elzanowski, 1995 .Cretaceous birds and avian phylogeny., Cour. Forschungsinst. Senckenb, 181 :37 –53 .
no DOI — not checkedJ. Gauthier, 1986 .Saurischian monophyly and the origin of birds.InK. Padian (ed.), The origin of birds and the evolution of flight.Mem. California Acad. Sci, 8 :1 –55 .
no DOI — not checkedZ. Kielan-Jaworowska, and R. Barsbold .1972 .Narrative of the Polish-Mongolian Palaeontological Expeditions 1967–1971., Paleontol. Pol, 27 :5 –16 .
no DOI — not checkedJ. A. Madsen, 1976 .Allosaurus fragilis A revised osteology., Bull. Utah Geol. Miner. Surv, 109 :1 –163 .
no DOI — not checkedG. R. Martin, 1995 .Eye.InA. S. King and J. McLelland (eds.),Form and function, 3 :311 –373 .San Diego, CA: Academic Press.
no DOI — not checkedJ. H. Ostrom, 1969 .Osteology of Deinonychus antirrhopus an unusual theropod dinosaur from the Lower Cretaceous of Montana., Peabody Mus. Nat. Hist. Bull. Yale Univ, 30 :1 –165 .
no DOI — not checkedL. M. Witmer, and L. D. Martin .1987 .The primitive features of the avian palate, with special reference to Mesozoic birds.InC. Mourer-Chauviré (coord.), L'evolution des oiseaux d'après le témoignage des fossiles.Doc. Lab. Geol. Lyon, 99 :21 –40 .
no DOI — not checkedR. L. Zusi, 1993 .Patterns of diversity in the avian skull.InJ. Hanken and B. K. Hall (eds.),The skull, 2 :391 –437 .Chicago: Univ. Chicago Press.
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