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A.R. Phani; S. Manorama; V.J. Rao. (2000). The nature of surface behavior of tin oxide doped sensors: X-ray photoelectron spectroscopy studies before and after exposure to liquid petroleum gas. , 61(6), 985–993. doi:10.1016/s0022-3697(99)00215-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research