1 | EU ETSI, ETSI SR 002 180: Requirements for Communication of Citizens with Authorities/Organizations in Case of Distress, 2004 |
2 | NCS. Public Switched Network Security Assessment Guidelines. 2002 |
3 | ITU. Handbook on Emergency Telecommunication, 2003 |
4 | EU ETSI, ETSI SR 002 299: Emergency Communications: European Regulatory Principles. 2004 |
5 | ITU-T. ETS Work in ITU-T Study Group 16. 2005 |
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