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Shigeaki Iwanaga; Hiroki Ishii; Hidetsugu Nagano; Masahiko Shimizu; Takashi Nishida; Michiaki Yakushiji. (1990). Mature Cystic Teratoma of the Uterine Cervix. , 16(4), 363–366. doi:10.1111/j.1447-0756.1990.tb00362.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research