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\bibitem{Vanderborght+VanGrieken1978} {\textquotedblleft}\textit{Trace metal analysis of water containing humic substances by X-ray fluorescence}{\textquotedblright}. Vanderborght BM, Van Grieken RE, International journal of environmental analytical chemistry \textbf{5}, 221 (1978).   http://doi.org/10.1080/03067317808071147

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