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IEEE Sensors Journal > 2016 > 16 > 13 > 5337 - 5343
IEEE Sensors Journal > 2015 > 15 > 12 > 6945 - 6953
IEEE Transactions on Wireless Communications > 2015 > 14 > 7 > 4075 - 4089
IEEE Communications Surveys & Tutorials > 2013 > 15 > 3 > 1210 - 1222