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IEEE Transactions on Antennas and Propagation > 2016 > 64 > 4 > 1209 - 1217
IET Microwaves, Antennas & Propagation > 2016 > 10 > 2 > 152 - 161
IEEE Communications Surveys & Tutorials > 2016 > 18 > 1 > 162 - 183
IEEE Antennas and Wireless Propagation Letters > 2016 > 15 > 666 - 669