1. The ABCs of HVDC transmission technologies;Bahrman;IEEE Power Eng Mag,2007
2. State of the art in ultrahigh-voltage transmission;Hammons;Proc IEEE,2012
3. Extruded cables for high voltage direct current transmission: advances in research and development;Mazzanti,2013
4. Design of earth electrode stations for high-voltage direct current (HVDC) links – general guidelines. TS 62344 © IEC:2013(E). ISBN 978-2-83220-575-4.