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Yang, Shubin; Gong, Yongji; Zhang, Jinshui; Zhan, Liang; Ma, Lulu; Fang, Zheyu; Vajtai, Robert; Wang, Xinchen; Ajayan, Pulickel M. . (2013). Exfoliated Graphitic Carbon Nitride Nanosheets as Efficient Catalysts for Hydrogen Evolution Under Visible Light. Advanced Materials, 25(17), 2452–2456. doi:10.1002/adma.201204453 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research