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Bedrintsev, A. A.; Chepyzhov, V. V. . (2017). Two Related Problems of Redundancy Reduction in Data Representation by Means of Convex Polyhedra. Journal of Communications Technology and Electronics, 62(12), 1456–1463. doi:10.1134/S106422691712004X 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research