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A DC method was used to determine La 2O 3, CeO 2, Pr 6O 11 , Sm 2O 3, Gd 2O 3, Dy 2O 3, Dy 2O 3, Y 2O 3 in Nd and Nd 2O 3 with oxygen argon controlled atmosphere on spectrograph reverse line dispersion 0 25 nm/mm.

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