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IEEE Antennas and Wireless Propagation Letters > 2009 > 8 > 248 - 252
IEEE Transactions on Antennas and Propagation > 2005 > 53 > 5 > 1762 - 1769
Electronics Letters > 1993 > 29 > 11 > 1021 - 1022
Electronics Letters > 1993 > 29 > 13 > 1165 - 1167
Electronics Letters > 1992 > 28 > 14 > 1326 - 1327
Electronics Letters > 1990 > 26 > 1 > 50 - 52
Electronics Letters > 1989 > 25 > 20 > 1338 - 1340