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6Weimers Lars, Eriksson K. HVDC Light an excellent tools for city center infeed [C]. Powergen Conference.Singapore, 1999: 1-5.
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8Urban Axelsson, Anders Holm Vattenfall. Gotland HVDC Light tsansmission world's first commercial small-scale DC transmission[C]. CIRED Conference in Nice France, 1999.
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10Gunnar Asplund, Kjell Eriksson, Over Tollerz. Land and sea cable interconnections with HVDC Light [C].CEPSI 2000 conference. Manila, Philippines, 2000.