ETSI ETS 300 938-1999 Digital Cellular Telecommunications System (Phase 2+); Mobile Station - Base Station System (MS - BSS) Interface; Data Link (DL) Layer Specification Fourth Edition; GSM 04.06 Version 5.3.1 Release 1996
2000ETSI ETS 300 938-2000 Digital Cellular Telecommunications System (Phase 2+); Mobile Station - Base Station System (MS - BSS) Interface; Data Link (DL) Layer Specification Fifth Edition; GSM 04.06 Version 5.4.1 Release 1996
1999ETSI ETS 300 938-1999 Digital Cellular Telecommunications System (Phase 2+); Mobile Station - Base Station System (MS - BSS) Interface; Data Link (DL) Layer Specification Fourth Edition; GSM 04.06 Version 5.3.1 Release 1996
1998ETSI ETS 300 938-1998 Digital Cellular Telecommunications System (Phase 2+); Mobile Station - Base Station System (MS - BSS) Interface; Data Link (DL) Layer Specification Third Edition; GSM 04.06 Version 5.2.1
1997ETSI ETS 300 938-1997 Digital Cellular Telecommunications System (Phase 2+); Mobile Station - Base Station System (MS - BSS) Interface; Data Link (DL) Layer Specification Second Edition; GSM 04.06 Version 5.1.1