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C. Carranza-Torres; C. Fairhurst. (2000). Application of the Convergence-Confinement method of tunnel design to rock masses that satisfy the Hoek-Brown failure criterion. , 15(2), 187–213. doi:10.1016/s0886-7798(00)00046-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research