KRAJEWSKI, M. The optimization of the basis for the social insurance contribution rates for individuals operating a business enterprise on their own pursuant to provisions applicable to business activities . Acta Universitatis Lodziensis. Folia Iuridica, [S. l.], v. 97, p. 279–295, 2021. DOI: 10.18778/0208-6069.97.16. Disponível em: https://czasopisma.uni.lodz.pl/Iuridica/article/view/11785. Acesso em: 4 may. 2024.