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WikiPedia: Đá_cổ_nhất http://records.viu.ca/~earles/zircon-jan01.htm http://www.livescience.com/environment/080925-olde... http://www.nature.com/ngeo/journal/vaop/ncurrent/f... http://www.nbcnews.com/id/26890176 http://newswise.com/articles/view/541751/ http://www.psrd.hawaii.edu/April04/lunarAnorthosit... http://www.lpi.usra.edu/meetings/gold99/pdf/7202.p... http://www.geology.wisc.edu/zircon/zircon_home.htm... http://www.geology.wisc.edu/~valley/zircons/Wilde2... http://www.geologinenseura.fi/bulletin/Volume75/Mu...