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ETSI TS 101 351 Digital cellular telecommunications system (Phase 2+) (GSM); General Packet Radio Service (GPRS); Mobile Station (MS) - Serving GPRS Support Node (SGSN); Logical Link Control (LLC) layer specification (GSM 04.64 version 6.2.0 Release 1997)
standard by European Telecommunications Standards Institute, 11/01/1998
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