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Al Gabri, Ahmed M.; Fardoun, Abbas A.; Ismail, Esam H. . (2015). Bridgeless PFC-Modified SEPIC Rectifier With Extended Gain for Universal Input Voltage Applications. IEEE Transactions on Power Electronics, 30(8), 4272–4282. doi:10.1109/TPEL.2014.2351806 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research