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Sahoo, Jagdish Prasad; Kumar, Bibhash . (2019). Stability of Circular Tunnels in Clay with an Overlay of Sand. International Journal of Geomechanics, 19(3), 06018039–. doi:10.1061/(ASCE)GM.1943-5622.0001360 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research