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WikiPedia: Sao_xung http://d-nb.info/gnd/4047828-2 http://vnexpress.net/GL/Khoa-hoc/2003/07/3B9C9A9E/ http://vnexpress.net/GL/Khoa-hoc/2005/02/3B9DB2FE/ http://www.bigear.org/vol1no1/burnell.htm http://www.sdss.org/supernova/aboutsupernova.html https://commons.wikimedia.org/wiki/Category:Pulsar...