CIGRE <br/><br/>
CIGRE Technical brochure-364 (B4.41)-2008; Systems with multiple DC infeed; Technical brochure 364. working group B4.41 December 2008 

 - paris  cigre  2008 
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<br/><br/><label>Universal Decimal Class. No.: </label>621.3.027.3  / CIG.08