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Rothman, Andrea. "Drone Buzzes Air France Jet Over Paris in Closest Shave Yet." Bloomberg Technology. Bloomberg, 4 Mar. 2016. Web. 5 May 2016. <http://www.bloomberg.com/news/articles/2016-03-04/drone-brushes-past-airbus-jet-above-paris-in-closest-shave-yet>.
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Nelson, Patrick. "GPS Breakthrough: Low-cost Accuracy within Centimeters." Network World. Network World, 8 May 2015. Web. 5 May 2016. <http://www.networkworld.com/article/2920157/internet-of-things/gps-breakthrough-with-low-cost-centimeter-accuracy.html>.
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"Rubidium Atomic Clock Experiment." RACE. NASA Microgravity Program, n.d. Web. 5 May 2016. <http://users.phys.psu.edu/~kgibble/space_clock.html>.
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"What Is GPS?" Sofar. Squarespace, n.d. Web. 5 May 2016. <http://www.sofar.co.za/gps-formats-explained/>.
"What Is GPS?" Teach ICT. Teach ICT, n.d. Web. 5 May 2016. <http://www.teach-ict.com/technology_explained/gps/gps.html>.