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\bibitem{VanGrieken_etal1982} {\textquotedblleft}\textit{Elemental constituents of atmospheric aerosols in Recife, North-East Brazil}{\textquotedblright}. Van Grieken R, Van {\textquoteright}t dack L, Costa Dantas C, Moura de Amorim W, Maenhaut W, Environmental pollution: series B : chemical and physical \textbf{4}, 143 (1982).   http://doi.org/10.1016/0143-148X(82)90025-8

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