ETSI TS 101 346

Digital cellular telecommunications system (Phase 2 ); General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface layer 3 specification (3GPP TS 09.18 version 7.5.0 Release 1998) Edition: 7.5.0
European Telecommunications Standards Institute / 01-Dec-2001 / 53 pages