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IEEE Internet of Things Journal > 2015 > 2 > 6 > 573 - 585
IEEE Antennas and Wireless Propagation Letters > 2015 > 14 > 1358 - 1361
IEEE Communications Letters > 2012 > 16 > 7 > 978 - 981
IEEE Wireless Communications Letters > 2012 > 1 > 2 > 101 - 104