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Development of 500kV DC PPLP-Insulated Oil-Filled Submarine CableFujimori, Akiharu; Fujii, Koichiro; Takashima, Hiroshi; Suzuki, Hiroshi; Mitani, Munehisa; Fujii, Osamu; Shigetoshi, Ikuo; Shimada, Mitsumasa · IEEJ Transactions on Power and Energy · 1996