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\bibitem{Facetti_etal1998} {\textquotedblleft}\textit{Heavy metals in sediments from the Paraguay river: a preliminary study}{\textquotedblright}. Facetti J, Dekov VM, Van Grieken R, The science of the total environment \textbf{209}, 79 (1998).   http://doi.org/10.1016/S0048-9697(97)00299-4

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