List of ship stations and maritime mobile service identity assignments / International Telecommunication Union
Manual for use by the maritime mobile and maritime mobile-satellite services / International Telecommunication Union
Sistema de socorro e de segurança marítima (GMDSS) : Diagrama de procedimentos para as comunicações em situação de perigo / IPTM - Instituto Portuário e dos Transportes Marítimos
Service mobile terrestre : rapports du CCIR, 1990: (ainsi que décisions): annexe 2 au volume VIII / Union Internationale des Télécommunications
Commission d'études 8 : questions du CCIR, 1990: volume XV-2 / Unión Internationale des Telecommunication