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\bibitem{Bernard+VanGrieken1992} {\textquotedblleft}\textit{Comparison and evaluation of hierarchical cluster techniques applied to automated electron probe X-ray microanalysis data}{\textquotedblright}. Bernard PC, Van Grieken RE, Analytica chimica acta \textbf{267}, 81 (1992).   http://doi.org/10.1016/0003-2670(92)85009-U

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