[1] [DB/OL]: http://www.virginiadiodes.com/
[2] [DB/OL]: http:// www.millitech.com/
[3] [DB/OL]: http://www.radiometer-physics.de/
[4] [DB/OL]: http://www.farran.com/
[5] [DB/OL]: http://www.northropgrumman.com/BusinessVentures/Microelectronics/Products/Pages/THz-Modules.aspx/
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