@misc{Del_Piero_G._On_1975,
 author={Del Piero, G.},
 volume={27},
 number={2},
 copyright={Creative Commons Attribution BY 4.0 license},
 address={Warszawa},
 journal={Archives of Mechanics},
 howpublished={online},
 year={1975},
 publisher={Polish Scientific Publishers IFTR},
 language={eng},
 language={pol},
 language={rus},
 language={fre},
 title={On the mathematical theory of elastic-plastic materials},
 type={Text},
 URL={http://rcin.org.pl/Content/147415/PDF/WA727_93859_P.262a-Del-Piero-Mathematical.pdf},
 keywords={Mechanika stosowana - czasopisma [KABA]},
}