@misc{Szczepanik_Ewa_High-order,
 author={Szczepanik, Ewa and Tret’yakov, Alexey},
 howpublished={online},
 publisher={Wydaw. Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={High-order extremal principles and P-factor penalty function method for solving irregular optimization problems},
}