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\bibitem{vanRoy_etal1994} {\textquotedblleft}\textit{A Fourier transform laser microprobe mass spectrometer with external ion source for organic and inorganic surface and micro-analysis}{\textquotedblright}. van Roy W, Struyf H, van Vaeck L, Gijbels R, Caravatti P Wiley, Chichester, page 463 (1994).

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