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Toshihiro Hisataki; Noriomi Miyao; Naoya Masumori; Atsushi Takahashi; Masahiro Yanase; Naoki Itoh; Taiji Tsukamoto. (2001). Risk factors for multiple intravesical recurrences of superficial bladder cancer. , 58(6), 0–939. doi:10.1016/s0090-4295(01)01435-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research