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DeJong, Jason; Randolph, Mark; DeGroot, Don; Yafrate, Nicholas . (2011). Closure to “Evaluation of Remolded Shear Strength and Sensitivity of Soft Clay Using Full-Flow Penetrometers” by Nicholas Yafrate, Jason DeJong, Don DeGroot, and Mark Randolph. Journal of Geotechnical and Geoenvironmental Engineering, 137(4), 440–441. doi:10.1061/(ASCE)GT.1943-5606.0000467 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research