1. 3GPP TR 33.969. 2014. Technical Specification Group Services and System Aspects; Study on Security aspects of Public Warning System (PWS) (Release 15) . http://www.3gpp.org/DynaReport/33969.htm . (2014). 3GPP TR 33.969. 2014. Technical Specification Group Services and System Aspects; Study on Security aspects of Public Warning System (PWS) (Release 15) . http://www.3gpp.org/DynaReport/33969.htm . (2014).
2. 3GPP TS 23.038. 2018. Technical Specification Group Core Network and Terminals; Alphabets and language-specific information (Release 15) . http://www.3gpp.org/dynareport/23038.htm . (2018). 3GPP TS 23.038. 2018. Technical Specification Group Core Network and Terminals; Alphabets and language-specific information (Release 15) . http://www.3gpp.org/dynareport/23038.htm . (2018).
3. 3GPP TS 23.041. 2018. Technical Specification Group Core Network and Terminals; Technical realization of Cell Broadcast Service (CBS) (Release 15) . http://www.3gpp.org/dynareport/23041.htm . (2018). 3GPP TS 23.041. 2018. Technical Specification Group Core Network and Terminals; Technical realization of Cell Broadcast Service (CBS) (Release 15) . http://www.3gpp.org/dynareport/23041.htm . (2018).
4. 3GPP TS 23.401. 2018. Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (Release 15) . http://www.3gpp.org/dynareport/23401.htm . (2018). 3GPP TS 23.401. 2018. Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (Release 15) . http://www.3gpp.org/dynareport/23401.htm . (2018).
5. 3GPP TS 29.168. 2018. Technical Specification Group Core Network and Terminals; Cell Broadcast Centre interfaces with the Evolved Packet Core (Release 15) . http://www.3gpp.org/dynareport/29168.htm . (2018). 3GPP TS 29.168. 2018. Technical Specification Group Core Network and Terminals; Cell Broadcast Centre interfaces with the Evolved Packet Core (Release 15) . http://www.3gpp.org/dynareport/29168.htm . (2018).