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\bibitem{Spolnik_etal2004} {\textquotedblleft}\textit{Chemical characterization of airborne particles in St. Martinus Cathedral in Weert, The Netherlands}{\textquotedblright}. Spolnik Z, Worobiec A, Injuk J, Neilen D, Schellen H, Van Grieken R, Microchimica acta \textbf{145}, 223 (2004).   http://doi.org/10.1007/S00604-003-0158-2

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