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Nolan, D. A.; Herman, R. M. . (1974). Increased image brightness caused by field adsorption in field-ion microscopy. II. Effects of field distortions in atomic orbitals. Physical Review B, 10(1), 50–54. doi:10.1103/PhysRevB.10.50 

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