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\bibitem{Held_etal1995} {\textquotedblleft}\textit{Determination of scandium in high-purity titanium using inductively coupled plasma mass spectrometry and glow discharge mass spectrometry as part of its certification as a reference material}{\textquotedblright}. Held A, Taylor P, Ingelbrecht C, de Bi{\`e}vre P, Broekaert J, van Straaten M, Gijbels R, Journal of analytical atomic spectrometry \textbf{10}, 849 (1995).   http://doi.org/10.1039/ja9951000849

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