VALENTE, Isabel Maria Freitas; FREIRE, Maria Raquel; FERNANDES, Sandra. Polycentrism in a post-hegemonic world and the future of the European Union. Debater a Europa, [S.l.], n. 15-1, p. 59-70, dez. 2016. ISSN 1647-6336. Disponível em: <http://impactum-journals.uc.pt/debatereuropa/article/view/3946>. Acesso em: 19 jun. 2018.