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Zhang, Jun-Cheng; Wang, Xusheng; Marriott, Gerard; Xu, Chao-Nan . (2019). Trap-controlled mechanoluminescent materials. Progress in Materials Science, (), S0079642519300131–. doi:10.1016/j.pmatsci.2019.02.001 

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