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Özkan, İ.; Erdem, B.; Ceylanoğlu, A. . (2015). Characterization of jointed rock masses for geotechnical classifications utilized in mine shaft stability analyses. International Journal of Rock Mechanics and Mining Sciences, 73(), 28–41. doi:10.1016/j.ijrmms.2014.10.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research