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- [1] Isotope Ratio Measurement of Lead, Neodymium and Neodymiumsamarium Mixtures, Hafnium and Hafnium-lutetium Mixtures with a Double Focusing Multiple Inductively Coupled Plasma Mass Spectrometer. Walder A J, Platzner I, Freedman P A. Journal of Analytical Atomic Spectrometry . 1993