@ARTICLE{_Contents_2021,
 volume={69},
 number={2},
 journal={Bulletin of the Polish Academy of Sciences Technical Sciences},
 pages={1},
 howpublished={online},
 year={2021},
 type={Contents},
 title={Contents},
 URL={http://journals.pan.pl/Content/119719/PDF/00_Spis_Bpast.No.69(2)_30.04.21_A_OK.pdf},
}