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IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 63 - 66
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1017 - 1020
IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 63 - 66
IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 1017 - 1020