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Ferrari, A. C.; Meyer, J. C.; Scardaci, V.; Casiraghi, C.; Lazzeri, M.; Mauri, F.; Piscanec, S.; Jiang, D.; Novoselov, K. S.; Roth, S.. (2006). Raman Spectrum of Graphene and Graphene Layers. , 97(18), 187401–0. doi:10.1103/physrevlett.97.187401 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research