Working procedures for the technical assembly and its working bodies of european / European Telecommunications Standards Institute
Report from the SRC on public networks : final version: approved August 1992 / European Telecommunications Standards Institute
ETSI technical specification GSM 11.10 : release note: mobile station conformity specifications / European Telecommunication Standards Institute
ETSI technical specification GSM 11.20 : update note : the GSM base station system: equipment specificationf / European Telecommunication Standards Institute