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Nobuyuki Ishibashi; Hikaru Kawai; Yoshihisa Kitazawa; Asato Tsuchiya. (1997). A large-N reduced model as superstring. , 498(1-2), 0–491. doi:10.1016/s0550-3213(97)00290-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research