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IEEE Sensors Journal > 2011 > 11 > 3 > 737 - 744
IEEE Transactions on Mobile Computing > 2011 > 10 > 6 > 797 - 809
IEEE Transactions on Mobile Computing > 2011 > 10 > 6 > 821 - 838
IEEE Transactions on Wireless Communications > 2011 > 10 > 4 > 1165 - 1175