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Liu, X.; Zhu, Z. Q. . (2014). Stator/Rotor Pole Combinations and Winding Configurations of Variable Flux Reluctance Machines. IEEE Transactions on Industry Applications, 50(6), 3675–3684. doi:10.1109/tia.2014.2315505 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research