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2017 IEEE AFRICON > 181 - 186
IEEE Transactions on Antennas and Propagation > 2014 > 62 > 4-2 > 1983 - 1990
IEEE Antennas and Wireless Propagation Letters > 2012 > 11 > 57 - 60
IEEE Transactions on Antennas and Propagation > 2011 > 59 > 4 > 1113 - 1122