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E. Elangovan; K. Ramesh; K. Ramamurthi. (2004). Studies on the structural and electrical properties of spray deposited SnO2:Sb thin films as a function of substrate temperature. , 130(8), 523–527. doi:10.1016/j.ssc.2004.03.015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research