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V.M. Sorokin; V.M. Chmyrev; A.K. Yaschenko. (2006). Possible DC electric field in the ionosphere related to seismicity. , 37(4), 666–670. doi:10.1016/j.asr.2005.05.066 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research