WALCZAK, Damian. Retirement Savings in an Ageing Society: a Challenge for Sustainable Development. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 5, n. 6, p. 100–113, 2017. DOI: 10.18559/SOEP.2017.6.6. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3635. Acesso em: 3 sep. 2026.