@misc{Nofer_Jerzy_The,
 author={Nofer, Jerzy},
 copyright={Nofer Institute of Occupational Medicine},
 howpublished={online},
 publisher={Nofer Institute of Occupational Medicine},
 language={pol},
 language={eng},
 language={rus},
 type={article},
 type={language document},
 title={The problem of industrial sickness absenteeism},
}