BAI, H.; HALL, S.; SHEPHERD, D. Convergence and Common Cycles in the European Union. Economic Issues, [S. l.], v. 2, n. 2, p. 59–71, 1997. Disponível em: https://economicissues.org.uk/index.php/EI_OJS/article/view/29. Acesso em: 27 jul. 2026.