1. Facebook. Safety Check. https://www.facebook.com/about/safetycheck. Facebook. Safety Check. https://www.facebook.com/about/safetycheck.
2. Nokia. LTE to the rescue in public safety networks. https://blog.networks.nokia.com/public-safety/2015/01/14/improving-public-safety-with-lte. Nokia. LTE to the rescue in public safety networks. https://blog.networks.nokia.com/public-safety/2015/01/14/improving-public-safety-with-lte.
3. LTE: the technology driver for future public safety communications
4. Sonnet Labs. Sonnet: revolutionary communications device for the adventurer in all of us. https://www.sonnetlabs.com/. Sonnet Labs. Sonnet: revolutionary communications device for the adventurer in all of us. https://www.sonnetlabs.com/.
5. Using SOS message propagation to estimate the location of immobilized persons