RATAJCZAK, Marek. Economics Today - Economics Tomorrow. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 5, n. 11, p. 20–34, 2017. DOI: 10.18559/SOEP.2017.11.2. Disponível em: https://www.journals.ue.poznan.pl/soep/article/view/3743. Acesso em: 22 sep. 2026.