European digital cellular telecommunications system (Phase 2) - Interworking between the Public Land Mobile Network (PLMN) and the Circuit Switched Public Data Network (CSPDN); English version ETS 300601:1994
欧洲数字蜂窝通信系统(第2阶段)——公共陆地移动网络(PLMN)和电路交换公共数据网络(CSPDN)之间的互通;英文版ETS 300601:1994