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V.O Balitska; B Butkievich; O.I Shpotyuk; M.M Vakiv. (2002). On the analytical description of ageing kinetics in ceramic manganite-based NTC thermistors. , 42(12), 2003–2007. doi:10.1016/s0026-2714(02)00096-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research