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    K.L. Lear et al.: “Selectively oxidized vertical cavity surface emitting lasers with 50 % power conversion efficiency”, Electronics Letters, 31, 208209, (1995).
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    R. Haitz et al.:, “The Case for a National Research Program on Semiconductor Lighting”, Annual Forum of the Optoelectronics Industry Development Association (1999).
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    J. Y. Tsao, “Light Emitting Diodes (LEDs) for General Illumination Update 2002”, Optoelectronics Industry Development Association (2002).
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    R. Haitz, J.Y. Tsao: “Solid-State Lighting: ‘The Case’ Ten Years After and Future Prospects”, Phys. Status Solidi, A208, 1729, (2011).
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    Y. Narukawa et al.: “White light emitting diodes with super-high luminous efficacy”, J. Phys., D 43, 354002, (2010) The Authors.