BALTAZAR, I. The European Union is at a crossroads: An Europe of different speeds? A study of the history of European unity. Debater a Europa, [S. l.], n. 25, p. 13-38, 2021. DOI: 10.14195/1647-6336_25_1. Disponível em: https://impactum-journals.uc.pt/debatereuropa/article/view/9249. Acesso em: 19 jan. 2025.