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Oliveira, A.M.; Kuo-Peng, P.; Sadowski, N.; Runcos, F.; Carlson, R.; Dular, P. . (2004). Finite-Element Analysis of a Double-Winding Induction Motor With a Special Rotor Bars Topology. IEEE Transactions on Magnetics, 40(2), 770–773. doi:10.1109/tmag.2004.824770 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research