Martínez Sánchez, José Antonio (June 2006). "Inventari del sistema ferroviari de viatgers" [Inventory of the passenger rail system]. Anàlisi de la xarxa ferroviària de la RMB [Study on the railway system in the Barcelona metropolitan area] (PDF) (Thesis) (in Catalan). Polytechnic University of Catalonia. p. 38. Retrieved 7 August 2015.