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IEEE Antennas and Wireless Propagation Letters > 2015 > 14 > 1105 - 1108
IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 1180 - 1183
IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 1560 - 1563
IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 353 - 356