ETSI ETR 111-1995 欧洲数字蜂窝通信系统(第2阶段).第1阶段基础设施和第2阶段移动台(MS)之间的互通(GSM 09.90,版本4.6.0).第4版
European Digital Cellular Telecommunications System (Phase 2); Interworking between Phase 1 Infrastructure and Phase 2 Mobile Stations (MS) (GSM 09.90 Version 4.6.0) Fourth Edition