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IEEE Antennas and Wireless Propagation Letters > 2010 > 9 > 79 - 82
IEEE Transactions on Circuits and Systems I: Regular Papers > 2009 > 56 > 7 > 1360 - 1372
IEEE Transactions on Vehicular Technology > 2008 > 57 > 4 > 2319 - 2333
IEEE Antennas and Wireless Propagation Letters > 2008 > 7 > 577 - 580