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\bibitem{VanBorman_etal1990} {\textquotedblleft}\textit{Lead particles in an urban atmosphere : an individual particle approach}{\textquotedblright}. Van Borman W, Wouters L, Van Grieken R, Adams F, The science of the total environment \textbf{90}, 55 (1990).   http://doi.org/10.1016/0048-9697(90)90185-W

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