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IEEE Sensors Journal > 2015 > 15 > 12 > 6767 - 6774
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 5 - 8
IEEE Sensors Journal > 2015 > 15 > 12 > 6767 - 6774
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 5 - 8