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Huang, Kuo-Min; Chang, Heng-Jui; Ho, Chong-Lung; Wu, Meng-Chyi . (2012). Enhanced Light Extraction Efficiency of GaN-Based LEDs With 3-D Colloidal-Photonic-Crystal Bottom Reflector. IEEE Photonics Technology Letters, 24(15), 1298–1300. doi:10.1109/lpt.2012.2202284 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research