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Ling, Xi; Xie, Liming; Fang, Yuan; Xu, Hua; Zhang, Haoli; Kong, Jing; Dresselhaus, Mildred S.; Zhang, Jin; Liu, Zhongfan . (2010). Can Graphene be used as a Substrate for Raman Enhancement?. Nano Letters, 10(2), 553–561. doi:10.1021/nl903414x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research