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\bibitem{Kuczumow_etal2000} {\textquotedblleft}\textit{Quantification problems in light element determination by grazing emission X-ray fluorescence}{\textquotedblright}. Kuczumow A, Claes M, Schmeling M, Van Grieken R, de Gendt S, Journal of analytical atomic spectrometry \textbf{15}, 415 (2000).   http://doi.org/10.1039/A908724I

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