Wojciechowicz, J. 2019. OBLIGATION TO RETURN UNDULY RECEIVED SICK PAY IN THE EVENT OF TAKING UP PAID EMPLOYMENT IN THE JUDICIAL DECISIONS OF COMMON COURTS AND THE SUPREME COURT. Studia Prawa Publicznego. 2(26) (Jun. 2019), 159–173. DOI:https://doi.org/10.14746/spp.2019.2.26.7.