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Sheng-Huoo Ni; Lutz Lehmann; Jenq-Jy Charng; Kuo-Feng Lo. (2006). Low-strain integrity testing of drilled piles with high slenderness ratio. , 33(6-7), 283–293. doi:10.1016/j.compgeo.2006.08.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research