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\bibitem{Claes_etal1999} {\textquotedblleft}\textit{Progress in laboratory grazing emission X-ray fluorescence spectrometry}{\textquotedblright}. Claes M, de Bokx P, Van Grieken R, X-ray spectrometry \textbf{28}, 224 (1999).   http://doi.org/10.1002/(SICI)1097-4539(199907/08)28:4<224::AID-XRS337>3.3.CO;2-W

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