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Sommer, L. Die Summe von Seltenen Erden (Lanthanide, Lanthan, Yttrium, Scandium) in Erzen. Z. Anal. Chem. 209, 448–449 (1965). https://doi.org/10.1007/BF00520642
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DOI: https://doi.org/10.1007/BF00520642