@misc{Erkhov_M.I._Extremum_1973,
 author={Erkhov, M.I.},
 volume={25},
 number={1},
 copyright={Creative Commons Attribution BY 4.0 license},
 address={Warszawa},
 journal={Archives of Mechanics},
 howpublished={online},
 year={1973},
 publisher={Polish Scientific Publishers IFTR},
 language={eng},
 language={pol},
 language={rus},
 type={Text},
 title={Extremum principles in the dynamics of rigid-plastic bodies and linear programming},
 URL={http://www.rcin.org.pl/Content/203803/PDF/WA727_110704_P.262-Erkhov-Extremum.pdf},
 keywords={Mechanika stosowana - czasopisma [KABA]},
}