Krajewski, Marcin. “The Concurrence of Pension and Disability Insurance of the Contractor Selected Issues”. Acta Universitatis Lodziensis. Folia Iuridica 88 (September 30, 2019): 143–155. Accessed February 11, 2026. https://czasopisma.uni.lodz.pl/Iuridica/article/view/5803.