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IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 63 - 66
IEEE Transactions on Antennas and Propagation > 2012 > 60 > 1 > 310 - 317
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1017 - 1020
IEEE Transactions on Antennas and Propagation > 2007 > 55 > 6-1 > 1582 - 1590