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\bibitem{Toeroek_etal1992} {\textquotedblleft}\textit{Single particle analysis of Hungarian background aerosol}{\textquotedblright}. T{\"o}r{\"o}k S, Sandor S, Xhoffer C, Van Grieken R, Meszaros E, Molnar A, Idojaras: quarterly journal of the Hungarian Meteorological Service \textbf{96}, 223 (1992)

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