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N. A. Abdullayev,K. M. Jafarli,Kh. V. Aliguliyeva,L. N. Aliyeva…. (2017). Effect of doping with rare-earth elements (Eu, Tb, Dy) on the conductivity of Bi2Te3layered single crystals. Semiconductors, 51(7), 942–946. doi:10.1134/S1063782617070028 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research