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\bibitem{Osan_etal2002} {\textquotedblleft}\textit{Application of thin-window EPMA to environmental problems in Hungary}{\textquotedblright}. Os{\'a}n J, Kurunczi S, T{\"o}r{\"o}k S, Worobiec A, Van Grieken R, Microchimica acta \textbf{139}, 111 (2002).   http://doi.org/10.1007/S006040200048

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