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\bibitem{Arana_etal2014} {\textquotedblleft}\textit{Optimized energy dispersive X-ray fluorescence analysis of atmospheric aerosols collected at pristine and perturbed Amazon Basin sites}{\textquotedblright}. Arana A, Loureiro AL, Barbosa HMJ, Van Grieken R, Artaxo P, X-ray spectrometry \textbf{43}, 228 (2014).   http://doi.org/10.1002/XRS.2544

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