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F.P. Vasil'ev; M.A. Vorontsov; O.A. Litvinova. (1979). On the optimal control of the process of thermal blooming. , 19(4), 272–278. doi:10.1016/0041-5553(79)90176-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research