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Amelin, Y; Krot, An; Hutcheon, Id; Ulyanov, Aa «Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions.». Science (New York, N.Y.), 297, 5587, Sep 2002, pàg. 1678–83. DOI: 10.1126/science.1073950. ISSN: 0036-8075. PMID: 12215641.