Novel Approaches on Sovereign Credit Ratings. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 11, n. 4, p. 1014–1026, 2018. DOI: 10.29020/nybg.ejpam.v11i4.3333. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3333. Acesso em: 24 nov. 2024.