@ARTICLE{_Contents_2021,
 volume={69},
 number={4},
 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/120538/00_Spis_Bpast.No.69(4)_27.08.21_druk.pdf},
}