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Trevisan, Riccardo; Costanzo, Alessandra . (2014). A 1-kW Contactless Energy Transfer System Based on a Rotary Transformer for Sealing Rollers. IEEE Transactions on Industrial Electronics, 61(11), 6337–6345. doi:10.1109/TIE.2014.2311395 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research