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Ulusay, R.. (2015). The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007-2014 || ISRM Suggested Method for Laboratory Determination of the Shear Strength of Rock Joints: Revised Version. , 10.1007/978-3-319-07713-0(Chapter 10), 131–142. doi:10.1007/978-3-319-07713-0_10 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research