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Yang, Wei; Tan, Honglai; Guo, Tianfu . (1994). Evolution of crack tip process zones. Modelling and Simulation in Materials Science and Engineering, 2(3A), 767–782. doi:10.1088/0965-0393/2/3A/023 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research