@ARTICLE{Szlązak_Nikodem_The_2016,
 author={Szlązak, Nikodem and Swolkień, Justyna},
 number={No 3},
 journal={Archives of Mining Sciences},
 howpublished={online},
 year={2016},
 publisher={Committee of Mining PAS},
 title={The Effectiveness of the Methane Drainage of Rock-Mass with a U Ventilation System},
 URL={http://ochroma.man.poznan.pl/Content/105536/PDF/10267-Volume61_Issue3-12_paper.pdf},
 doi={10.1515/amsc-2016-0044},
}