@ARTICLE{Kaliski_Maciej_Hard_2016,
 author={Kaliski, Maciej and Gawlik, Lidia and Szurlej, Adam and Sikora, Andrzej P. and Kamiński, Jacek},
 number={No 2},
 journal={Archives of Mining Sciences},
 howpublished={online},
 year={2016},
 publisher={Committee of Mining PAS},
 title={Hard Coal in the Fuel-Mix Of Poland: The Long-Term Perspective},
 URL={http://ochroma.man.poznan.pl/Content/105509/PDF/10267-Volume61_Issue2-10_paper.pdf},
 doi={10.1515/amsc-2016-0025},
}