HELLER, Janusz; WARŻAŁA, Rafał. Is Poland in a middle income trap? A theoretical and empirical analysis. Ekonomia i Prawo. Economics and Law, [S. l.], v. 17, n. 4, p. 367–381, 2018. DOI: 10.12775/EiP.2018.027. Disponível em: https://apcz.umk.pl/EiP/article/view/EiP.2018.027. Acesso em: 8 jul. 2025.