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IEEE Transactions on Antennas and Propagation > 2014 > 62 > 12 > 6317 - 6324
IEEE Transactions on Antennas and Propagation > 2010 > 58 > 9 > 3044 - 3049
Electronics Letters > 2008 > 44 > 4 > 258 - 259
IEEE Transactions on Communications > 2008 > 56 > 7 > 1157 - 1168