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Waters, C. L.; Menk, F. W.; Fraser, B. J. . (1991). The resonance structure of low latitude Pc3 geomagnetic pulsations. Geophysical Research Letters, 18(12), 2293–2296. doi:10.1029/91gl02550 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research