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Lei, Xianqi; Li, Congling; Shi, Xinghua; Xu, Xianghong; Wei, Yujie . (2015). Notch strengthening or weakening governed by transition of shear failure to normal mode fracture. Scientific Reports, 5(1), 10537–. doi:10.1038/srep10537 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research