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Manhesa, Gérard; Allègre, Claude J.; Dupréa, Bernard; and Hamelin, Bruno (1980). “Lead isotope study of basic-ultrabasic layered complexes: Speculations about the age of the earth and primitive mantle characteristics”. Earth and Planetary Science Letters47 (3): 370–382. Bibcode: 1980E&PSL..47..370M. doi:10.1016/0012-821X(80)90024-2.