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Tenhunen, A.; Holopainen, T.P.; Arkkio, A. . (2004). Effects of Saturation on the Forces in Induction Motors With Whirling Cage Rotor. IEEE Transactions on Magnetics, 40(2), 766–769. doi:10.1109/tmag.2004.824549 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research