@misc{Otachel_Zdzisław_On,
 author={Otachel, Zdzisław},
 howpublished={online},
 publisher={Uniwersytet Marii Curie-Skłodowskiej},
 language={pol},
 language={ang},
 type={artykuł},
 title={On a variant of Jessen – Mercer’s inequality},
 keywords={chemia},
}