Perin, D Pigini, A Zagliani, F Lakshminarasimha, C.S Ravi, K.N <br/><br/>
CESI-AT-4444 - 1988; EHVDC transmission systems - State of art - design of external insulation from the point of view of DC permanent voltage under polluted conditions Vol.1.2/3.1 

 - Italy  CESI  1988 
 - 50p 
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