1. Advanced Television(2015).EchoStar Mobile to launch 2016.Advanced Televison
2. May 11. Onadvanced‐television.com/2015/05/11/EchoStar‐mobile‐to‐launch‐2016. Accessed 2016 May 13.
3. Aerospace Technology(2010).SkyTerra 1 telecommunications satellite United States of America. Onwww.aerospace‐technology.com/projects/skyterra1telecommuni/. Accessed 2014 Oct. 7.
4. Airbus Defence and Space(2013).A communications satellite with vision. News release. June 18. Onwww.space‐airbusds.com/en/news2/alphasat‐designed‐and‐built‐by‐airbus‐defence‐and‐space.html. Accessed 2014 Oct. 13.
5. Airbus Defence and Space(2014a).Quartz crystal oscillators OCXO‐F. Product sheet. Onwww.space‐airbusds.com/en/equipment/quartz‐crystal‐oscillators‐ocxo‐f.html. Accessed 2014 Oct. 10.