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ETSI TS 155 241
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ETSI TS 155 241 Digital cellular telecommunications system (Phase 2+)(GSM); Specification of the GIA4 integrity algorithm for General Packet Radio Service (GPRS); GIA4 specification (3GPP TS 55.241 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017