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Yu, Xiao-Hui; Liu, Jian-Ni; Wu, Da-Yong . (2019). Colorless PI Structure Design and Evaluation for Achieving Low CTE Target. Materials Today Communications, (), 100562–. doi:10.1016/j.mtcomm.2019.100562 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research