SAWULSKI , Jakub. The Pension System Deficit in Poland and Attempts at its Reduction in Response to the Economic Crisis. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 2, n. 6, p. 77–95, 2014. DOI: 10.18559/r9ndn875. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3300. Acesso em: 3 sep. 2026.