@misc{Szubert_Zuzanna_Certain,
 author={Szubert, Zuzanna and Sobala, Wojciech},
 copyright={Nofer Institute of Occupational Medicine},
 howpublished={online},
 publisher={Nofer Institute of Occupational Medicine},
 publisher={Polish Association of Occupational Medicine},
 language={pol, eng},
 type={serial - article},
 type={language document},
 title={Certain sickness absence factors among workers older than 45 years},
}