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Münker, C.; Pfänder, Jörg; Weyer, Stefan; Büchl, Anette; Kleine, Thorsten; Mezger, Klaus (2003). Evolution of Planetary Cores and the Earth-Moon System from Nb/Ta Systematics. Science, 301(5629), pp. 84-87. American Association for the Advancement of Science 10.1126/science.1084662
