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\bibitem{Kartal_etal1993} {\textquotedblleft}\textit{Composition and sources of atmospheric particulate matter at Kayseri, Central Turkey}{\textquotedblright}. Kartal S, Dogan M, Rojas CM, Van Grieken R, The science of the total environment \textbf{133}, 83 (1993).   http://doi.org/10.1016/0048-9697(93)90114-L

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