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\bibitem{vanEspen_etal1979} {\textquotedblleft}\textit{Effective sample weight from scatter peaks in energy-dispersive x-ray fluorescence}{\textquotedblright}. van Espen P, Van {\textquoteright}t dack L, Adams F, Van Grieken R, Analytical chemistry \textbf{51}, 961 (1979).   http://doi.org/10.1021/AC50043A042

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