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\bibitem{VanDyck_etal1980} {\textquotedblleft}\textit{Automatic absorption correction in x-ray fluorescence analysis of intermediate thickness samples using a dual external reference signal}{\textquotedblright}. Van Dyck P, Markowicz A, Van Grieken R, X-ray spectrometry \textbf{9}, 70 (1980).   http://doi.org/10.1002/XRS.1300090209

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