Forster, Catherine A.; Chiappe, Luis M.; Krause, David W. & Sampson, Scott D. (1996): The first Cretaceous bird from Madagascar. Nature, 382: 532-534. DOI10.1038/382532a0 (HTML abstract)
(en) Michael SY Lee, Andrea Cau, Naish Darren et Dyke Gareth J., « Morphological Clocks in Paleontology, and a Mid-Cretaceous Origin of Crown Aves », Systematic Biology, Oxford Journals, vol. 63, no 3, , p. 442–9 (PMID24449041, DOI10.1093/sysbio/syt110)
(en) Michael SY Lee, Andrea Cau, Naish Darren et Dyke Gareth J., « Morphological Clocks in Paleontology, and a Mid-Cretaceous Origin of Crown Aves », Systematic Biology, Oxford Journals, vol. 63, no 3, , p. 442–9 (PMID24449041, DOI10.1093/sysbio/syt110)