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\bibitem{Struyf_etal1993} {\textquotedblleft}\textit{Laser microprobe Fourier transform mass spectrometer with external ion source for organic and inorganic microanalysis}{\textquotedblright}. Struyf H, van Roy W, van Vaeck L, Gijbels R, Caravatti P San Francisco Press, San Francisco, Calif., page 595 (1993).

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