Postal services [documento electrónico] : hybrid mail: document type definitions for customer to operator: a common set of default tags: ENV 14014: July 2001 / European Committee for Standardization
Working procedures for the technical assembly and its working bodies of european / European Telecommunications Standards Institute
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