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IEEE Antennas and Propagation Magazine > 2013 > 55 > 1 > 253 - 273
IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 551 - 554
IEEE Transactions on Wireless Communications > 2010 > 9 > 1 > 245 - 255
IEEE Transactions on Antennas and Propagation > 2008 > 56 > 9 > 2929 - 2936