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                        "doi": "10.3390/en3040619",
                        "unstructured": "Pierid, J.; Axelson, U.; Eriksson, E.; Salomon son, D.; Bauer, P.; Czech, B. A wind farm electrical systems evaluation with EeFarm-II. Energies 2010, 3, 619–633"
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                        "unstructured": "Vrana, T.; Torres-Olguin, R.; Liu, B.; Haileselassie, T. The North Sea Super Grid-a technical perspective. In Proceedings of 9th IET International Conference on AC and DC Power Transmission; London, UK, 19–21 October 2010; pp. 1–5"
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