ETS 300 086 : radio equipment and systems land mobile service: technical characteristics and test conditions for radio equipment with an internal or external RF connector intended primarily for analogue speech / European Telecommunications Standards Institute
ETS 300 133-3 : paging systems (PS): european radio message system (ERMES): part 3: network aspects: (annexes): ETS 300 133 -3 / European Telecommunications Standards Institute
ETS 300 133-7 : paging systems (PS): european radio message system (ERMES): part 7: operation and maintenance aspects / European Telecommunications Standards Institute
ETS 300 136 : integrated services digital network (ISDN): closed user group (CUG) supplementary service: service description / European Telecommunications Standards Institute