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== Bibliographia ==
* Luis W. Alvarez, Walter Alvarez, Frank Asaro, Helen V. Michel, "[https://pdfs.semanticscholar.org/f23d/f624d2e7d945277a4c06d6d66008eb0f4242.pdf Extraterrestrial Cause for the Cretaceous-Tertiary Extinction]" in ''Science'' n.s. vol. 208 (6 Iunii 1980) pp. 1095-1108 [http://faculty.jsd.claremont.edu/dmcfarlane/bio145mcfarlane/PDFs/alvarez%20_1980_impact%20cause%20of%20extinction.pdf alibi]
* Kunio Kaiho, Naga Oshima, "[https://www.nature.com/articles/s41598-017-14199-x Site of asteroid impact changed the history of life on Earth: the low probability of mass extinction]" in ''Scientific Reports'' vol. 7 no. 14855 (9 Novembris 2017)
* Maureen A. O’Leary et al., ''Stratigraphy and paleobiology of the Upper Cretaceous-Lower Paleogene sediments from the Trans-Saharan Seaway in Mali'' (''Bulletin of the American Museum of Natural History'', no. 436) [http://digitallibrary.amnh.org/handle/2246/6950 Textus interretialis]