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IEEE Microwave Magazine > 2010 > 11 > 7-Supplement > 44 - 50
IEEE Communications Magazine > 2009 > 47 > 12 > 34 - 40
IEEE Communications Magazine > 2009 > 47 > 10 > 72 - 81
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 432 - 435
IEEE Communications Magazine > 2007 > 45 > 12 > 44 - 51