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Han, Liu; Qing-Qing, Sun; Lin, Chen; Yan, Xu; Shi-Jin, Ding; Wei, Zhang; Shi-Li, Zhang . (2010). Band Structures of Metal-Oxide Capped Graphene: A First Principles Study. Chinese Physics Letters, 27(7), 077201–. doi:10.1088/0256-307X/27/7/077201 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research