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\bibitem{Zwozdziak_etal2013} {\textquotedblleft}\textit{Infiltration or indoor sources as determinants of the elemental composition of particulate matter inside a school in Wroclaw, Poland?}{\textquotedblright}.Zwozdziak A, Sowka I, Krupi{\'n}ska B, Zwozdziak J, Nych A, Building and environment \textbf{66}, 173 (2013).   http://doi.org/10.1016/J.BUILDENV.2013.04.023

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