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IEEE Antennas and Wireless Propagation Letters > 2011 > 10 > 338 - 341
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 251 - 254
IEEE Antennas and Wireless Propagation Letters > 2011 > 10 > 338 - 341
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 251 - 254