Estelle Bourdon: Osteological evidence for sister group relationship between pseudo-toothed birds (Aves: Odontopterygiformes) and waterfowls (Anseriformes). in Naturwissenschaften, Verlag Springer Berlin / Heidelberg, ISSN0028-1042, Heft Volume 92, Number 12 / Dezember 2005 DOI:10.1007/s00114-005-0047-0
Daniel T. Ksepka Flight performance of the largest volant bird (англ.) // Proceedings of the National Academy of Sciences. — 2014. — ISSN1091-6490. — DOI:10.1073/pnas.1320297111 — PMID 25002475.
Estelle Bourdon: Osteological evidence for sister group relationship between pseudo-toothed birds (Aves: Odontopterygiformes) and waterfowls (Anseriformes). in Naturwissenschaften, Verlag Springer Berlin / Heidelberg, ISSN0028-1042, Heft Volume 92, Number 12 / Dezember 2005 DOI:10.1007/s00114-005-0047-0
Daniel T. Ksepka Flight performance of the largest volant bird (англ.) // Proceedings of the National Academy of Sciences. — 2014. — ISSN1091-6490. — DOI:10.1073/pnas.1320297111 — PMID 25002475.