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Petkov, Valeri; Cozzoli, P. Davide; Buonsanti, Raffaella; Cingolani, Roberto; Ren, Yang . (2009). Size, Shape, and Internal Atomic Ordering of Nanocrystals by Atomic Pair Distribution Functions: A Comparative Study of γ-Fe <sub/>2</sub> O <sub/>3</sub> Nanosized Spheres and Tetrapods. Journal of the American Chemical Society, 131(40), 14264–14266. doi:10.1021/ja9067589 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research