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\bibitem{Spolnik_etal2007} {\textquotedblleft}\textit{Influence of different types of heating systems on particulate air pollutant deposition: the case of churches situated in a cold climate}{\textquotedblright}. Spolnik Z, Worobiec A, Samek L, Bencs L, Belikov K, Van Grieken R, Journal of cultural heritage \textbf{8}, 7 (2007).   http://doi.org/10.1016/J.CULHER.2006.09.003

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