References
- "High-Voltage Direct Current Handbook. First Edition", D. Wilhelm
- S. Kresge and E. C. Sakshaug, "Zinc Oxide Experience and Applications of HVDC Stations," IEEE Conference on Overvoltage on Integrated ACDC Systems, Winnipeg, Canada, July 9-11,1980.
- IEC 60700-1. Thyristor Valves for High Voltage Direct Current (HVDC) Power Transmission.