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\bibitem{Alfeld_etal2007} {\textquotedblleft}\textit{Depth profiling of multilayered systems by means of confocal μ-XRF in the laboratory an at HASYLAB BL L: a comparison}{\textquotedblright}. Alfeld M, Vekemans B, Janssens K, Falkenberg G, Broekaert JAC, Gao N, Gibson D  (2007).

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