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Feng, Xia-Ting; Zhang, Chuanqing; Qiu, Shili; Zhou, Hui; Jiang, Quan; Li, Shaojun . (2016). Dynamic design method for deep hard rock tunnels and its application. Journal of Rock Mechanics and Geotechnical Engineering, 8(4), 443–461. doi:10.1016/j.jrmge.2016.01.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research