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Chiba, Koji; Yamaguchi, Kohei; Ando, Makoto; Miyake, Hideaki; Fujisawa, Masato . (2012). Expression Pattern of Testicular claudin-11 in Infertile Men. Urology, 80(5), 1161.e13–1161.e17. doi:10.1016/j.urology.2012.06.036 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research