A European response to “letterbox companies” in social, tax and transport: rules and case. CUADERNOS DE DERECHO TRANSNACIONAL, [S. l.], v. 10, n. 2, p. 536–566, 2018. DOI: 10.20318/cdt.2018.4388. Disponível em: https://e-revistas.uc3m.es/index.php/CDT/article/view/4388. Acesso em: 5 dec. 2025.