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IEEE Transactions on Microwave Theory and Techniques > 2009 > 57 > 1 > 237 - 242
1993 IEEE MTT-S International Microwave Symposium Digest > 645 - 648 vol.2
PESC ' 00088 Record., 00019th Annual IEEE Power Electronics Specialists... > 1988 > 805 - 812 vol.2
Electronics Letters > 1971 > 7 > 17 > 501 - 502