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Frontiers in Energy > 2014 > 8 > 2 > 212-220
IEEE Transactions on Industrial Electronics > 2014 > 61 > 8 > 3823 - 3834
IEEE Transactions on Sustainable Energy > 2014 > 5 > 4 > 1116 - 1125
IEEE Transactions on Sustainable Energy > 2014 > 5 > 4 > 1145 - 1155