"O Metro em números" [The Metro in numbers – Network evolution] (in Portuguese). Metropolitano de Lisboa, E.P.E. Retrieved 1 September 2023.
"Intervalo entre comboios" [Time between vehicles] (in Portuguese). Metropolitano de Lisboa, E.P.E. Archived from the original on 31 December 2016. Retrieved 30 December 2016.
"Intervalo entre comboios" [Time between vehicles] (in Portuguese). Metropolitano de Lisboa, E.P.E. Archived from the original on 31 December 2016. Retrieved 30 December 2016.