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Fujihisa, Hiroshi; Akahama, Yuichi; Kawamura, Haruki; Ohishi, Yasuo; Shimomura, Osamu; Yamawaki, Hiroshi; Sakashita, Mami; Gotoh, Yoshito; Takeya, Satoshi; Honda, Kazumasa . (2006). Cluster Structure of the Epsilon Phase of Solid Oxygen. Physical Review Letters, 97(8), 085503–. doi:10.1103/PhysRevLett.97.085503 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research