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Berman, Lonny E.; Batterman, Boris W.; Blakely, Jack M. . (1988). Structure of submonolayer gold on silicon (111) from x-ray standing-wave triangulation. Physical Review B, 38(8), 5397–5405. doi:10.1103/PhysRevB.38.5397 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research