@ARTICLE{Zawada_Jan_Rock_2000,
 author={Zawada, Jan},
 number={No 4},
 journal={Archives of Mining Sciences},
 pages={443-462},
 howpublished={online},
 year={2000},
 publisher={Committee of Mining PAS},
 type={Article},
 title={Rock Crushing by Punches at Various Velocities of Load Application},
 URL={http://ochroma.man.poznan.pl/Content/132299/PDF/3_MINING_45_4_2000_Zawada_ROCK.pdf},
}