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Proceedings of the IEEE > 2016 > 104 > 3 > 519 - 529
IEEE Antennas and Propagation Magazine > 2008 > 50 > 4 > 53 - 65
2005 IEEE Antennas and Propagation Society International Symposium > 1B > 84 - 87 vol. 1B
Electronics Letters > 1991 > 27 > 6 > 491 - 492
IEE Proceedings F - Communications, Radar and Signal Processing > 1980 > 127 > 4 > 301 - 311