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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 657 - 661
IEEE Journal of Solid-State Circuits > 2009 > 44 > 10 > 2808 - 2816
IEEE Communications Letters > 2007 > 11 > 8 > 656 - 658
IEEE Antennas and Wireless Propagation Letters > 2003 > 2 > 1 > 114 - 117