1. Assisted GNSS. https://en.wikipedia.org/wiki/Assisted_GPS. Assisted GNSS. https://en.wikipedia.org/wiki/Assisted_GPS.
2. AT&T Cell on Wings. http://about.att.com/innovationblog/cows_fly. AT&T Cell on Wings. http://about.att.com/innovationblog/cows_fly.
3. DJI Phantom Drone. https://www.dji.com/phantom. DJI Phantom Drone. https://www.dji.com/phantom.
4. DJI Wind 8 Octocopter. https://www.quadrocopter.com/DJI-Wind-8-Octocopter_p_1841.html. DJI Wind 8 Octocopter. https://www.quadrocopter.com/DJI-Wind-8-Octocopter_p_1841.html.
5. Engineers design drones that can stay aloft for five days. http://news.mit.edu/2017/drones-stay-aloft-five-days-0607. Engineers design drones that can stay aloft for five days. http://news.mit.edu/2017/drones-stay-aloft-five-days-0607.