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IEEE Transactions on Antennas and Propagation > 2017 > 65 > 4 > 1570 - 1578
IEEE Transactions on Circuits and Systems I: Regular Papers > 2016 > 63 > 5 > 727 - 738
IEEE Transactions on Antennas and Propagation > 2013 > 61 > 5 > 2783 - 2791