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Pfänder, Jörg A.; Münker, Carsten; Stracke, Andreas; Mezger, Klaus (2007). Nb/Ta and Zr/Hf in ocean island basalts — Implications for crust–mantle differentiation and the fate of Niobium. Earth and planetary science letters, 254(1-2), pp. 158-172. Elsevier 10.1016/j.epsl.2006.11.027
