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A. A. Khokhryakov; M. V. Mikhaleva; A. S. Paivin. (2006). Electronic absorption spectra of nickel dichloride and nickel oxide solutions in the 2CsCl-NaCl and KCl-NaCl metls. , 51(8), 1311–1314. doi:10.1134/s0036023606080195 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research