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WO2010145690A1   [0002] 
WO2010115452A   [0003] 
EP2458725A1   [0006] 
US3942089A   [0008] 
WO2012103936A1   [0009] 
US6519169B1   [0010] 
US20120170338A1   [0010] 
WO2011060812A1   [0011] 
WO2011067120A   [0030]  [0043] 

Description and Perspective Applications of New Multilevel-Terminal HVDC System Concepts   [0007]