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Iwasaki, Hideo; Kobayashi, Norio; Koike, Yoji; Kikuchi, Masae; Syono, Yasuhiko; Noto, Koshichi; Muto, Yoshio . (1988). Upper and Lower Critical Fields of High- <i>T</i> <sub/>c</sub> Tl-Ba-Ca-Cu-O System. Japanese Journal of Applied Physics, 27(Part 2, No. 9), L1631–L1633. doi:10.1143/JJAP.27.L1631 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research