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Tanuma, R.; Mori, D.; Kamata, Isaho; Tsuchida, Hidekazu . (2012). X-Ray Three-Dimensional Topography Imaging of Basal-Plane and Threading-Edge Dislocations in 4H-SiC. Materials Science Forum, 717-720(), 323–326. doi:10.4028/www.scientific.net/msf.717-720.323 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research