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\bibitem{Akselsson_etal1976} {\textquotedblleft}\textit{Application of proton induced X-ray emission analysis to the St. Louis regional air pollution study}{\textquotedblright}. Akselsson R, Orsini C, Meinert DL, Johansson TB, Van Grieken RE, Kaufmann HC, Chapman KR, Nelson JW, Winchester JW,  (1976)

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