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Ishihara, Yukihiro; Haigh, Stuart; Koseki, Junichi . (2020). Assessment of base capacity of open-ended tubular piles installed by the Rotary Cutting Press-in method. Soils and Foundations, 60(5), 1189–1201. doi:10.1016/j.sandf.2020.07.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research