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Miao-Chan Tsai; Sheng-Horng Yen; Ying-Chung Lu; Yen-Kuang Kuo. (2011). Numerical Study of Blue InGaN Light-Emitting Diodes With Varied Barrier Thicknesses. , 23(2), 76–78. doi:10.1109/lpt.2010.2091119 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research