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Oberreiter, Lukas; Seifert, Udo; Barato, Andre C. . (2019). Subharmonic oscillations in stochastic systems under periodic driving. Physical Review E, 100(1), 012135–. doi:10.1103/PhysRevE.100.012135 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research