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\bibitem{Bekshaev+VanGrieken2002} {\textquotedblleft}\textit{Substrates with a periodic surface structure in grazing-exit X-ray microanalysis}{\textquotedblright}. Bekshaev A, Van Grieken R, Spectrochimica acta: part B : atomic spectroscopy \textbf{57}, 865 (2002).   http://doi.org/10.1016/S0584-8547(02)00019-8

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