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I.A. Karapatnitski; K.A. Mit’; D.M. Mukhamedshina; N.B. Beisenkhanov. (2002). Optical, structural and electrical properties of tin oxide films prepared by magnetron sputtering. , 151-152(none), 76–81. doi:10.1016/s0257-8972(01)01611-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research