“The extreme legal complexity of administrative files to which the European Union regulations on the coordination of the national social security systems of the member states apply: An inductive analysis of Portuguese case law compared with Spanish law on the subject”, revsegsoc, no. 46, pp. 121–130, Mar. 2026, Accessed: Nov. 06, 2026. Available: https://revista.laborum.es/index.php/revsegsoc/article/view/1277