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Vajda, Vivi; Raine, J. Ian; Hollis, Christopher J. (2001). “Indication of global deforestation at the Cretaceous–Tertiary boundary by New Zealand fern spike”. Science294 (5547): 1700–1702. Bibcode: 2001Sci...294.1700V. doi:10.1126/science.1064706. PMID11721051.
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Brochu, C.A. (2004). “Calibration age and quartet divergence date estimation”. Evolution58 (6): 1375–1382. doi:10.1554/03-509. PMID15266985.
Slack, K, E; Jones, C M; Ando, T; Harrison, G L; Fordyce, R E; Arnason, U; Penny, D (2006). “Early Penguin Fossils, Plus Mitochondrial Genomes, Calibrate Avian Evolution”. Molecular Biology and Evolution23 (6): 1144–1155. doi:10.1093/molbev/msj124. PMID16533822.
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Clarke, J.A.; Tambussi, C.P.; Noriega, J.I.; Erickson, G.M.; Ketcham, R.A. (2005). “Definitive fossil evidence for the extant avian radiation in the Cretaceous”. Nature433 (7023): 305–308. Bibcode: 2005Natur.433..305C. doi:10.1038/nature03150. PMID15662422.
Mitchell, K.J.; Llamas, B.; Soubrier, J.; Rawlence, N.J.; Worthy, T.H.; Wood, J.; Lee, M.S.Y.; Cooper, A. (2014). “Ancient DNA reveals elephant birds and kiwi are sister taxa and clarifies ratite bird evolution”. Science344 (6186): 989–900. Bibcode: 2014Sci...344..898M. doi:10.1126/science.1251981. hdl:2328/35953. PMID24855267.
Yonezawa, Takahiro; Segawa, Takahiro; Mori, Hiroshi; Campos, Paula F.; Hongoh, Yuichi; Endo, Hideki; Akiyoshi, Ayumi; Kohno, Naoki et al. (2017). “Phylogenomics and Morphology of Extinct Paleognaths Reveal the Origin and Evolution of the Ratites”. Current Biology27 (1): 68–77. doi:10.1016/j.cub.2016.10.029. PMID27989673.
Smit, Jan; Montanari, Alessandro; Swinburne, Nicola H.; Alvarez, Walter; Hildebrand, Alan R.; Margolis, Stanley V.; Claeys, Philippe; Lowrie, William et al. (1992). “Tektite-bearing, deep-water clastic unit at the Cretaceous-Tertiary boundary in northeastern Mexico”. Geology20 (2): 99–103. Bibcode: 1992Geo....20...99S. doi:10.1130/0091-7613(1992)020<0099:TBDWCU>2.3.CO;2. PMID11537752.