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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 1423 - 1426
IEEE Wireless Communications Letters > 2015 > 4 > 5 > 557 - 560
IEEE Communications Letters > 2014 > 18 > 7 > 1191 - 1193
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 5 > 1512 - 1520