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Yang, Jierui; Yun, Zhihao . (2020). The Thevenin equivalent based power flow method for integrated transmission and radial distribution networks. International Journal of Electrical Power & Energy Systems, 123(), 106294–. doi:10.1016/j.ijepes.2020.106294 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research