Specifications of the SIM-ME interface : ETSI technical specification GSM 11.11: release note: version 3.12.0 / European Telecommunications Standards Institute
The GSM base station system : equipment specification: recommendation GSM 11.20: update note: version 3.10.0 / European Telecommunications Standards Institute
System simulator specification : recommendation GSM 11.40: release note: version 3.6.0 / European Telecommunications Standards Institute
DCS 1800 system simulator specification : recommendation GSM 11.40-DCS: update note: version 3.2.0 / European Telecommunications Standards Institute