@ARTICLE{Bytnar_Krzysztof_Alkalis_2013,
 author={Bytnar, Krzysztof and Burmistrz, Piotr},
 number={No 3},
 journal={Archives of Mining Sciences},
 howpublished={online},
 year={2013},
 publisher={Committee of Mining PAS},
 title={Alkalis in Coal and Coal Cleaning Products / Alkalia W Węglu I Productach Jego Wzbogacania},
 URL={http://www.journals.pan.pl/Content/93287/PDF/10267-Volume58_Issue3-23_paper.pdf},
 doi={10.2478/amsc-2013-0064},
}