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Wu, Congyi; Li, Min; Huang, Yu; Rong, Youmin . (2021). Cutting of polyethylene terephthalate (PET) film by 355 nm nanosecond laser. Optics & Laser Technology, 133(), 106565–. doi:10.1016/j.optlastec.2020.106565 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research