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IEEE Communications Surveys & Tutorials > 2010 > 12 > 3 > 357 - 375
IEEE Communications Surveys & Tutorials > 2009 > 11 > 4 > 78 - 108
IEEE Communications Magazine > 2007 > 45 > 4 > 114 - 121
IEEE Transactions on Systems, Man, and Cybernetics, Part C (Applications... > 2002 > 32 > 4 > 293 - 306