41，GSM 02.60: "Digital cellular telecommunications system (Phase 2＋); General Packet Radio Service (GPRS); Service description; Stage 1".
52，GSM 03.03: "Digital cellular telecommunications system (Phase 2＋); Numbering, addressing and identification".
63，GSM 03.08: "Digital cellular telecommunications system (Phase 2＋); Organisation of subscriberdata".
74，GSM 03.60: "Digital cellular telecommunication system (Phase 2＋); General Packet Radio Service(GPRS); Service Description, Stage 2".
85，GSM 04.08: "Digital cellular telecommunications system (Phase 2＋), Mobile radio interface layer3 specification".
96，GSM 09.02: "Digital cellular telecommunications system (Phase 1); Mobile Application Part(MAP) specification".
107，GSM 09.60: "Digital cellular telecommunications system (Phase 2＋), General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface".
