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Kasikci, Ismail. (2018). Short Circuits in Power Systems: A Practical Guide to IEC 60909-0 (A Practical Guide to IEC 60909) || The Significance of IEC 60909-0. , 10.1002/9783527803378(), 29–31. doi:10.1002/9783527803378.ch3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research