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IET Optoelectronics > 2015 > 9 > 4 > 158 - 162
IEEE Journal of Selected Topics in Quantum Electronics > 2007 > 13 > 2 > 177 - 184
IET Optoelectronics > 2015 > 9 > 4 > 158 - 162
IEEE Journal of Selected Topics in Quantum Electronics > 2007 > 13 > 2 > 177 - 184