2005UNE-ETS 300920 Ed3:2005 Digital cellular telecommunications system (Phase 2+) (GSM); Security aspects (GSM 02.09 version 5.2.1 Release 1996) (Endorsed by AENOR in October of 2005.)
2005UNE-ETS 300920 Ed2:2005 Digital cellular telecommunications system (Phase 2+) (GSM); Security aspects (GSM 02.09 version 5.1.1) (Endorsed by AENOR in October of 2005.)
2005UNE-ETS 300920 Ed1:2005 Digital cellular telecommunications system; Security aspects (GSM 02.09 version 5.0.1) (Endorsed by AENOR in October of 2005.)