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Kouichi Rikitake; Takahiro Akiyama; Wataru Takashima; Keiichi Kaneto. (1997). Relationships between crystallinity and conductivity in evaporated C60 films. , 86(1-3), 0–2358. doi:10.1016/s0379-6779(97)81160-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research