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Pavel Zapletal, Vlastimil Hudeček and Vitaly Trofimov

References Dziurzynski W., Krach A., Palka T., 2009. Method of Regulating Elements of the Methane Drainage Network Using Computer Simulation. Arch. Min. Sci., Vol. 54, No 2, p. 159-187. Dziurzynski W., Kruczkowski J., 2011. Variability of the volumetric air flow rate in a mine fan channel for various damper positions. Arch. Min. Sci., Vol. 56, No 4, p. 641-650. Gacek Z., Olajossy A., 2007. Material balance in a pseudo-steady state of natural gas flow. Arch. Min. Sci., Vol. 52, No 2, p. 171

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Krzysztof Wierzchowski, Jarosław Chećko and Ireneusz Pyka

from Indiana. International Journal of Coal Geology, 63, 36-57. Mercury Study Report to Congress, 1997. Volume V: Health Effects of Mercury and Mercury Compounds, EPA-452/R-97-007. Ozbayoglu G., 2011. Partitioning of major and trace elements of a Turkish lignite with size and density. Physicochem. Probl. Miner. Process., 4, 51-60. Ozbayoglu G., 2013. Removal of hazardous air pollutants based on commercial coal preparation data. Physicochem. Probl. Miner. Process., 49 (2), 621-629. Pavlish J.H., Sondreal

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Zdzisław Adamczyk, Barbara Białecka, Joanna Całusz Moszko, Joanna Komorek and Małgorzata Lewandowska

F.H., 2004. A preliminary study on the enrichment mechanism and occurrence of hazardous trace elements in the Tertiary lignite from the Shenbei coalfield. China. International Journal of Coal Geology, 57, 187-196. Różkowska A., Ptak B., 1995. Pierwiastki podrzędne i śladowe w górnośląskich węglach kamiennych. Przegląd Geologiczny, 43, 6, 478-481. Różkowska A., Ptak B., 1995a. Atlas geochemiczny złóż węgla kamiennego Górnośląskiego Zagłębia Węglowego. Państwowy Instytut Geologiczny, Warszawa. Schatzel S.J., Stewart B

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Magdalena Kokowska-Pawłowska and Ewa Krzeszowska

proxies examined. Chemical Geology, 324-325, p. 132-147. Zhang J., Ren D., Zhu Y., Chou Ch., Zeng R., Zheng B., 2004. Mineral matter and potentially hazardous trace elements in coals from Qianxi Fault Depression Area in southwestern Guizhou, China. International Journal of Coal Geology, 57, 49-61.