1ABB Review 4/2008: HVDC, ABB-from pioneer to world leader.
2Jurg Waldmeyer, Wang Zhengming, Six Inch Thyristors for UHVDC, Minutes of the 2006 International Conference on UHV Transmission Technology. Beiiing. China. Nov.28-29. 2006.
3Bjorn Backlund, Thomas Setz, Voltage defi-nitions for Phase Control and Bi.Directionally Controlled Thyristors, ABB Application Note No. 5SYA2049-01, March 2007.