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IEEE Transactions on Wireless Communications > 2008 > 7 > 9 > 3468 - 3476
IEEE Transactions on Systems, Man, and Cybernetics, Part C (Applications... > 2007 > 37 > 4 > 494 - 503
IEEE Antennas and Wireless Propagation Letters > 2007 > 6 > 223 - 226