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IEEE Transactions on Power Electronics > 2009 > 24 > 5 > 1173 - 1181
IEEE Transactions on Circuits and Systems I: Regular Papers > 2007 > 54 > 8 > 1647 - 1656
IEE Proceedings H - Microwaves, Optics and Antennas > 1983 > 130 > 6 > 385 - 390