A system of systems solution for perimeter control : combining unmanned aerial system with unattended ground sensor networkKaugerand, Jaanus; Preden, Jürgo-Sören; Suurjaak, Erki; Astapov, Sergei; Mõtus, Leo; Pahtma, Raido9th Annual IEEE International Systems Conference : April 13-16, 2015, Vancouver, British Columbia, Canada : proceedings2015 / p. 317-323 : ill https://doi.org/10.1109/SYSCON.2015.7116770