Open systems interconnection; protocol for providing the connectionless-mode network service; identical with ISO 8473:1988 (status as of 1989)— 65 стр.
Open systems interconnection; protocol combinations to provide the network service; provision and support of the connectionless-mode network service; identical with ISO/IEC 8880-3:1990— 13 стр.
Digital cellular telecommunications system (Phase 2+) - General Packet Radio Service (GPRS) - Service description - Stage 1 (GSM 02.60 version 6.3.1 Release 1997)