ETSI TS 101 297 Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Mobile Station (MS) - Serving GPRS Support Node (SGSN); Subnetwork Dependent Convergence Protocol (SNDCP) (3GPP TS 04.65 version 8.2.0 Release 1999)

standard by European Telecommunications Standards Institute, 10/01/2001