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\bibitem{Janssens+vanEspen1986} {\textquotedblleft}\textit{Implementation of an expert system for the qualitative interpretation of x-ray-fluorescence spectra}{\textquotedblright}. Janssens K, van Espen P, Analytica chimica acta \textbf{184}, 117 (1986).   http://doi.org/10.1016/S0003-2670(00)86475-2

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