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\bibitem{Smits+VanGrieken1977} {\textquotedblleft}\textit{Optimization of a simple spotting procedure for x-ray fluorescence analysis of waters}{\textquotedblright}. Smits J, Van Grieken R, Analytica chimica acta \textbf{88}, 97 (1977).   http://doi.org/10.1016/S0003-2670(01)96053-2

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