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Kriener, M.; Segawa, Kouji; Ren, Zhi; Sasaki, Satoshi; Ando, Yoichi. (2011). Bulk Superconducting Phase with a Full Energy Gap in the Doped Topological Insulator Cu_{x}Bi_{2}Se_{3}. , 106(12), 127004–0. doi:10.1103/physrevlett.106.127004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research