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Lin, Wei; Ziolkowski, Richard W.; Baum, Thomas C. . (2017). 28 GHz Compact Omnidirectional Circularly Polarized Antenna for Device-to-Device Communications in the Future 5G Systems. IEEE Transactions on Antennas and Propagation, 65(12), 6904–6914. doi:10.1109/tap.2017.2759899 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research