Mena Muñoz S, Martínez Fernández JL. Information and Entertainment Channels at Underground and Buses Systems in Spain. Estud. mensaje periodís. [Internet]. 2012 Jan. 23 [cited 2026 Jul. 10];17(2):531-48. Available from: https://revistas.ucm.es/index.php/ESMP/article/view/38129