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IEEE Antennas and Wireless Propagation Letters > 2014 > 13 > 880 - 883
IEEE Antennas and Wireless Propagation Letters > 2013 > 12 > 1692 - 1695
IEEE Antennas and Wireless Propagation Letters > 2011 > 10 > 1039 - 1042
2010 Asia-Pacific Microwave Conference > 766 - 769