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IEEE Transactions on Communications > 2009 > 57 > 12 > 3571 - 3578
IEEE Sensors Journal > 2008 > 8 > 7 > 1079 - 1088
IEEE Sensors Journal > 2008 > 8 > 7 > 1105 - 1113
IEEE Transactions on Signal Processing > 2008 > 56 > 8-1 > 3458 - 3467