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\bibitem{Belikov_etal2006} {\textquotedblleft}\textit{EDXRF determination of impurities in potassium dihydrogenphosphate single crystals and raw materials}{\textquotedblright}. Belikov KN, Mikhailova LI, Spolnik ZM, Van Grieken R, X-ray spectrometry \textbf{35}, 112 (2006).   http://doi.org/10.1002/XRS.874

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