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IEEE Transactions on Microwave Theory and Techniques > 2011 > 59 > 3 > 678 - 686
IEEE Transactions on Microwave Theory and Techniques > 2010 > 58 > 7-2 > 1910 - 1916
IEEE Journal of Solid-State Circuits > 2009 > 44 > 11 > 3019 - 3029