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\bibitem{Vanderstappen+VanGrieken1978} {\textquotedblleft}\textit{Co-crystallization with 1-(2-pyridylazo)-2-naphthol, and X-ray fluorescence, for trace metal analysis of water}{\textquotedblright}. Vanderstappen MG, Van Grieken RE, Talanta : the international journal of pure and applied analytical chemistry \textbf{25}, 653 (1978).   http://doi.org/10.1016/0039-9140(78)80166-0

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