PÉREZ, Antonio F. U.S. Federalism and Spanish Autonomy - Lessons from U.S. Federalism for the External Activities of Substate Entities. Anuario Español de Derecho Internacional, [S. l.], v. 17, p. 79–129, 2001. DOI: 10.15581/010.17.28468. Disponível em: https://revistas.unav.edu/index.php/anuario-esp-dcho-internacional/article/view/28468. Acesso em: 23 apr. 2026.