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\bibitem{Worobiec_etal2008} {\textquotedblleft}\textit{Historical changes in air pollution in the tri-border region of Poland, Czech Republic and Germany}{\textquotedblright}. Worobiec A, Zwozdziak A, S{\'o}wka I, Zwozdziak J, Stefaniak EA, Buczy{\'n}ska A, Krata A, van Meel K, Van Grieken R, G{\'o}rka M, Jedrysek M-O, Environment protection engineering \textbf{34}, 81 (2008)

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