@ARTICLE{Szlązak_Jan_The_2001,
 author={Szlązak, Jan},
 number={No 4},
 journal={Archives of Mining Sciences},
 pages={451-468},
 howpublished={online},
 year={2001},
 publisher={Committee of Mining PAS},
 type={Article},
 title={The determination of a co-efficient of longwall gob permeability},
 URL={http://journals.pan.pl/Content/132262/PDF/6_MINING_46_4_2001_Szlazak_DETERMINATION.pdf},
}