SOBAŃSKI, K. ‘Dark matter’ in the external sector of the United States. Economics and Business Review, [S. l.], v. 5, n. 2, p. 86–108, 2019. DOI: 10.18559/ebr.2019.2.5. Disponível em: https://journals.ue.poznan.pl/ebr/article/view/362. Acesso em: 23 jun. 2024.