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GANIKHODJAEV, NASIR N.; GANIKHODJAEV, RASUL N.; JAMILOV, U. U. . (2015). Quadratic stochastic operators and zero-sum game dynamics. Ergodic Theory and Dynamical Systems, 35(5), 1443–1473. doi:10.1017/etds.2013.109 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research