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IEEE Electrification Magazine > 2014 > 2 > 4 > 4 - 39
Proceedings of the IEEE > 2013 > 101 > 4 > 866 - 875
IEEE Transactions on Energy Conversion > 2011 > 26 > 2 > 603 - 614
IEEE Power and Energy Magazine > 2009 > 7 > 1 > 50 - 54