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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 2675 - 2678
IEEE Journal of Selected Topics in Quantum Electronics > 2009 > 15 > 3 > 792 - 798
Electronics Letters > 2008 > 44 > 3 > 243 - 244
IEEE Journal of Quantum Electronics > 2007 > 43 > 8 > 709 - 713