@ARTICLE{Machniak_Łukasz_Method_2017,
 author={Machniak, Łukasz and Kozioł, Wiesław},
 number={No 1},
 journal={Archives of Mining Sciences},
 howpublished={online},
 year={2017},
 publisher={Committee of Mining PAS},
 title={Method of Assessment of Hard Rock Workability using Bucket Wheel Excavators},
 URL={http://journals.pan.pl/Content/105565/PDF/10267-Volume62_Issue1-06_paper.pdf},
 doi={10.1515/amsc-2017-0006},
}