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Ray, S. Saha; Sahoo, S. . (2015). New Exact Solutions of Fractional Zakharov—Kuznetsov and Modified Zakharov—Kuznetsov Equations Using Fractional Sub-Equation Method. Communications in Theoretical Physics, 63(1), 25–30. doi:10.1088/0253-6102/63/1/05 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research