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Bondarchuk, O.; Lyubinetsky, I. . (2007). Preparation of TiO[sub 2](110)-(1×1) surface via UHV cleavage: An scanning tunneling microscopy study. Review of Scientific Instruments, 78(11), 113907–. doi:10.1063/1.2814160 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research