@misc{Petryk_H._On_1991,
 author={Petryk, H.},
 volume={43},
 number={2-3},
 copyright={Creative Commons Attribution BY 4.0 license},
 address={Warszawa},
 journal={Archives of Mechanics},
 howpublished={online},
 year={1991},
 publisher={Polish Scientific Publishers IFTR},
 language={eng},
 type={Text},
 title={On the second-order work in plasticity},
 URL={http://rcin.org.pl/Content/69939/PDF/WA727_18046_43-2-3-1991_AMS_Petryk-14.pdf},
 keywords={Mechanika stosowana - czasopisma [KABA]},
}