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WikiPedia: Kỷ_Phấn_Trắng http://www.physorg.com/news10978.html http://www.ucmp.berkeley.edu/mesozoic/cretaceous/c... http://www.ucm.es/info/estratig/vol31/10ovek.pdf http://www.stratigraphy.org/ICSchart/ChronostratCh... http://www.stratigraphy.org/gssp.htm http://www.stratigraphy.org/index.php/ics-chart-ti... https://commons.wikimedia.org/wiki/Category:Cretac...