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Piek, Jürgen; Wille, Christian; Warzok, Rolf; Gaab, Michael-Robert . (1998). Waterjet dissection of the brain: experimental and first clinical results. Journal of Neurosurgery, 89(5), 861–864. doi:10.3171/jns.1998.89.5.0861 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research