@ARTICLE{Lehtsier_Oleg_Increase_2014,
 author={Lehtsier, Oleg},
 number={No 2},
 journal={Teka Commission of Motorization and Power Industry in Agriculture},
 howpublished={online},
 year={2014},
 publisher={The Lublin Branch of the Polish Academy of Sciences},
 title={Increase accuracy of system operation of unloading heavy coal sinksand middlings in jigs},
}