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IEEE Microwave and Wireless Components Letters > 2015 > 25 > 9 > 609 - 611
IEEE Microwave and Wireless Components Letters > 2015 > 25 > 9 > 624 - 626
IEEE Spectrum > 2015 > 52 > 9 > 50 - 56
IEEE Transactions on Wireless Communications > 2015 > 14 > 9 > 5098 - 5110