@ARTICLE{Kowalski_Andrzej_Surface_2001,
 author={Kowalski, Andrzej},
 number={No 4},
 journal={Archives of Mining Sciences},
 pages={391-406},
 howpublished={online},
 year={2001},
 publisher={Committee of Mining PAS},
 type={Article},
 title={Surface subsidence and rate of its increaments based on measur ements and theory},
 URL={http://czasopisma.pan.pl/Content/132259/PDF/3_MINING_46_4_2001_Kowalski_SURFACE.pdf},
}