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\bibitem{Ravindra_etal2004} {\textquotedblleft}\textit{Platinum group elements in the environment and their health risk}{\textquotedblright}. Ravindra K, Bencs L, Van Grieken R, The science of the total environment \textbf{318}, 1 (2004).   http://doi.org/10.1016/S0048-9697(03)00372-3

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