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IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 795 - 798
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 978 - 981
IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 379 - 382
IEEE Antennas and Wireless Propagation Letters > 2004 > 3 > 1 > 123 - 126