PRETS 300 504-1995 European Digital Cellular Telecommunications System (Phase 2); Types of Mobile Stations (MS) (GSM 02.06 Version 4.4.0) Third Edition
1997PRETS 300 504-1997 Digitales Mobilfunk-Telekommunikationssystem (Phase 2); Arten von Mobilstationen (MS) (GSM 02.06 Version 4.5.1; vierte Ausgabe)
1995PRETS 300 504-1995 European Digital Cellular Telecommunications System (Phase 2); Types of Mobile Stations (MS) (GSM 02.06 Version 4.4.0) Third Edition
1993PRETS 300 504-1993 Europäisches digitales Mobilfunk-Telekommunikationssystem (Phase 2); Arten von Mobilstationen (MS) (GSM 02.06)