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\bibitem{VanDyck_etal1986} {\textquotedblleft}\textit{Enhancement effect in X-ray fluorescence analysis of environmental samples of medium thickness}{\textquotedblright}. Van Dyck PM, T{\"o}r{\"o}k SB, Van Grieken RE, Analytical chemistry \textbf{58}, 1761 (1986).   http://doi.org/10.1021/AC00121A036

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