@misc{Nagórko_W._On_1983,
 author={Nagórko, W.},
 volume={35},
 number={4},
 copyright={Creative Commons Attribution BY 4.0 license},
 address={Warszawa},
 journal={Archives of Mechanics},
 howpublished={online},
 year={1983},
 publisher={Polish Scientific Publishers IFTR},
 language={eng},
 type={Text},
 title={On approximate structures in mechanics},
 URL={http://rcin.org.pl/Content/121125/PDF/WA727_18091_35-4-1983_AMS_Nagorko-02.pdf},
 keywords={Mechanika stosowana - czasopisma [KABA]},
}