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Yang, Liming; Zeng, Xiang-Chao; Yu, Hong-fa . (2015). Study on crack density of concrete exposed to stress corrosion. Construction and Building Materials, 82(), 264–273. doi:10.1016/j.conbuildmat.2014.12.042 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research