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\bibitem{Oprya_etal2012} {\textquotedblleft}\textit{Size distribution and chemical properties of welding fumes of inhalable particles}{\textquotedblright}. Oprya M, Kiro S, Worobiec A, Horemans B, Darchuk L, Novakovic V, Ennan A, Van Grieken R, Journal of aerosol science \textbf{45}, 50 (2012).   http://doi.org/10.1016/J.JAEROSCI.2011.10.004

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