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WikiPedia: Tầng Apt http://www.sciencedirect.com/science/article/pii/S... http://adsabs.harvard.edu/abs/2002PalOc..17.1041L http://adsabs.harvard.edu/abs/2008E&PSL.271...88L http://stratigraphy.science.purdue.edu/charts/Time... //dx.doi.org/10.1016%2Fj.epsl.2008.03.055 //dx.doi.org/10.1029%2F2001pa000623 http://www.stratigraphy.org/index.php/ics-chart-ti... http://bomax.botany.pl/cgi-bin/pubs/data/article_p... https://www.geo.umass.edu/faculty/leckie/Leckie%20... https://web.archive.org/web/20040511055802/http://...