49.
Brown Boveri. Directional power relays type PM : Relays and Protection Schemes- CH- ES 61-51.1 E / Brown Boveri
50.
Brown Boveri. Static relay for the protection of motors types ITX 162, ITX163 : Relays and Protection Schemes- CH- ES 61-31.1 E / Brown Boveri
51.
Verlant & Beaurain: Toute la connexion electrique
52.
BBC : Leittechnik
Data:
[s.d.]
53.
Legislação sobre o sector energético em Portugal
54.
Access to energy : A2E Mission / Fundação EDP
