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IEEE Communications Letters > 2007 > 11 > 12 > 934 - 936
IEEE Communications Letters > 2007 > 11 > 6 > 513 - 515
IEEE Communications Magazine > 2007 > 45 > 8 > 62 - 70
IEEE Wireless Communications > 2007 > 14 > 4 > 28 - 33
IEEE Antennas and Wireless Propagation Letters > 2004 > 3 > 1 > 269 - 272