@misc{Beemsterboer_Willibrord_On,
 author={Beemsterboer, Willibrord and Stewart, Roy and Groothoff, Johan and Nijhuis, Frans},
 copyright={Beemsterboer, Willibrord},
 copyright={Stewart, Roy},
 copyright={Groothoff, Johan},
 copyright={Nijhuis, Frans},
 howpublished={online},
 publisher={Instytut Medycyny Pracy w Łodzi im. prof. J. Nofera},
 publisher={Polskie Towarzystwo Medycyny Pracy},
 language={eng},
 type={czasopismo - artykuł},
 type={dokument piśmienniczy},
 title={On regional differences in determinants of sick leave frequency for cleaning workers in two regions of the Netherlands: a comparative study},
}