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Nieckarz, Zenon; Baranski, Piotr; Mlynarczyk, Janusz; Kulak, Andrzej; Wiszniowski, Jan . (2015). Comparison of the charge moment change calculated from electrostatic analysis and from ELF radio observations. Journal of Geophysical Research: Atmospheres, 120(1), 63–72. doi:10.1002/2014jd022289 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research