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\bibitem{Bondarenko_etal1994} {\textquotedblleft}\textit{Classification of coal mine dust particles through fuzzy clustering of their energy-dispersive electron microprobe X-ray spectra}{\textquotedblright}. Bondarenko I, van Espen P, Treiger B, Van Grieken R, Adams F, Microbeam analysis \textbf{3}, 33 (1994)

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