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Zhang, Yiyun; Ma, Zetao; Zhang, Xuhui; Wang, T.; Choi, H. W. . (2014). Optically pumped whispering-gallery mode lasing from 2-μm GaN micro-disks pivoted on Si. Applied Physics Letters, 104(22), 221106–. doi:10.1063/1.4881183 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research