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Milpas, Enrique; Torres, Manuel; Murguía, Gabriela. (2011). Magnetic field barriers in graphene: an analytically solvable model. , 23(24), 245304–0. doi:10.1088/0953-8984/23/24/245304 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research