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IEEE Microwave Magazine > 2009 > 10 > 2 > 77 - 87
IEEE Journal of Selected Topics in Quantum Electronics > 2008 > 14 > 2 > 449 - 457
IEEE Microwave Magazine > 2009 > 10 > 2 > 77 - 87
IEEE Journal of Selected Topics in Quantum Electronics > 2008 > 14 > 2 > 449 - 457