R. . Rodrigues, «The Lisbon metropolitan area transport network and its relation to Spain and Europe», UNISCI discuss. pap., n.º 16, pp. 35–48, ene. 2008, Accedido: nov. 24, 2024. Disponible en: https://revistas.ucm.es/index.php/UNIS/article/view/UNIS0808130035A