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\bibitem{Spolnik_etal1999} {\textquotedblleft}\textit{Quantification in grazing-emission X-ray fluorescence spectrometry}{\textquotedblright}. Spolnik ZM, Claes M, Van Grieken RE, de Bokx PK, Urbach HP, Spectrochimica acta: part B : atomic spectroscopy \textbf{54}, 1525 (1999).   http://doi.org/10.1016/S0584-8547(99)00051-8

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