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WikiPedia: Kỷ_Than_Đá http://www.geo-lieven.com/erdzeitalter/karbon/karb... http://www.highbeam.com/library/docfree.asp?DOCID=... http://adsabs.harvard.edu/abs/2008Sci...322...64H http://www.eeb.uconn.edu/Courses/Eeb477/Dudley_98.... //www.ncbi.nlm.nih.gov/pubmed/18832639 //dx.doi.org/10.1126%2Fscience.1161648 http://www.stratigraphy.org/gssp.htm http://www.stratigraphy.org/gts.htm https://commons.wikimedia.org/wiki/Category:Carbon...