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Prommetta, Jonas; Schindler, Jakob; Jaeger, Johann; Keil, Timo; Butterer, Christoph; Ebner, Guenter . (2020). Protection Coordination of AC/DC Intersystem Faults in Hybrid Transmission Grids. IEEE Transactions on Power Delivery, (), 1–1. doi:10.1109/TPWRD.2020.3000731 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research