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A. A. Zadorozhko;J. Chen;A. D. Chepelianskii;D. Konstantinov;. (2021). Motional quantum states of surface electrons on liquid helium in a tilted magnetic field . Physical Review B, (), –. doi:10.1103/PhysRevB.103.054507 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research