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\bibitem{Smekens_etal2005} {\textquotedblleft}\textit{Characterisation of soot emitted by domestic heating, aircraft and cars using diesel or biodiesel}{\textquotedblright}. Smekens A, Godoi RHM, Berghmans P, Van Grieken R, Journal of atmospheric chemistry \textbf{52}, 45 (2005).   http://doi.org/10.1007/S10874-005-6903-7

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