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Wang, Sea-Fue; Hsu, Yung-Fu; Chen, Chi-Huei . (2014). Effects of Nb2O5, TiO2, SiO2, and CaO additions on the loss characteristics of Mn-Zn Ferrite. Journal of Electroceramics, 33(3-4), 172–179. doi:10.1007/s10832-014-9943-z 

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