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O'Nions, R.K; Frank, M; von Blanckenburg, F; Ling, H.-F (1998). Secular variation of Nd and Pb isotopes in ferromanganese crusts from the Atlantic, Indian and Pacific Oceans. Earth and planetary science letters, 155(1-2), pp. 15-28. Elsevier 10.1016/S0012-821X(97)00207-0
