ETSI documentation service : the official ETSI deliverables CD-ROMs / European Telecommunications Standards Institute
ETSI technical specification GSM 11.10 : release note: mobile station conformity specifications / European Telecommunication Standards Institute
ETR 006 : network aspects: numbering and addressing for the memorandum of understanding (MOU) on integrated services digital network (ISDN) (priorities 1 and 2) / European Telecommunications Standards Institute
ETR 010 : ISDN standards management (ISM): the ETSI basic guide on the european integrated services digital network / European Telecommunications Standards Institute