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\bibitem{Gijbels+Dams1973} {\textquotedblleft}\textit{Determination of silicon in natural and pollution aerosols by 14-MeV neutron activation analysis}{\textquotedblright}. Gijbels R, Dams R, Analytica chimica acta \textbf{63}, 369 (1973).   http://doi.org/10.1016/S0003-2670(01)82362-X

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