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\bibitem{Avigo_etal2008} {\textquotedblleft}\textit{Particulate matter analysis at elementary schools in Curitiba, Brazil}{\textquotedblright}. Avigo D, Godoi AFL, Janissek PR, Makarovska Y, Krata A, Potgieter-Vermaak S, Alfoldy B, Van Grieken R, Godoi RHM, Analytical and bioanalytical chemistry \textbf{391}, 1459 (2008).   http://doi.org/10.1007/S00216-008-2031-Y

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