@ARTICLE{Krawczyk_Jerzy_An_2002,
 author={Krawczyk, Jerzy},
 number={No 4},
 pages={489-496},
 journal={Archives of Mining Sciences},
 howpublished={online},
 year={2002},
 publisher={Committee of Mining PAS},
 title={An example of pressure and velocity wave propagation in a model of a ventilation drift},
 type={Article},
 URL={http://ochroma.man.poznan.pl/Content/132197/PDF-MASTER/4_MINING_47_4_2002_Krawczyk_EXAMPLE.pdf},
}