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Sebastian D. Timar; Rida T. Farouki; Tait S. Smith; Casey L. Boyadjieff. (2005). Algorithms for time–optimal control of CNC machines along curved tool paths. , 21(1), 37–53. doi:10.1016/j.rcim.2004.05.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research