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Liu, Yanzhen; Li, Yongfeng; Yang, Yonggang; Wen, Yuefang; Wang, Maozhang . (2011). Reduction of Graphene Oxide by Thiourea. Journal of Nanoscience and Nanotechnology, 11(11), 10082–10086. doi:10.1166/jnn.2011.4985 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research