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WikiPedia: Kỷ_Permi http://www.ucmp.berkeley.edu/permian/glassmts.html http://www.ucmp.berkeley.edu/permian/permstrat.htm... http://adsabs.harvard.edu/abs/2008Sci...322...64H //www.ncbi.nlm.nih.gov/pubmed/18832639 //dx.doi.org/10.1126%2Fscience.1161648 http://dx.doi.org/10.1130/G21295.1 http://www.stratigraphy.org/ http://www.stratigraphy.org/gssp.htm http://www.stratigraphy.org/index.php/ics-chart-ti... https://commons.wikimedia.org/wiki/Category:Permia...