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\bibitem{Worobiec_etal2006} {\textquotedblleft}\textit{Study of the winter and summer changes of the air composition in the church of Szalowa, Poland, related to conservation}{\textquotedblright}. Worobiec A, Samek L, Spolnik Z, Kontozova V, Stefaniak E, Van Grieken R, Microchimica acta \textbf{156}, 253 (2006).   http://doi.org/10.1007/S00604-006-0619-5

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